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Read the following passage and mark the letter A, B,C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 33.An endangered species is a species (24)_______ population is (25) _______small that it is in danger of becoming extinct. Many countries have laws offering special protection to these species; (26) _______, forbidding hunting (27)_______ banning their sales. Only a few of the many truly endangered species actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially become extinct, without gaining public notice.Many of these laws are (28) _______. Typical areas of controversy include: criteria for placing a species on the endangered species list, and criteria for removing a species (29)_______ the list once its population has recovered.A listing as an endangered species can backfire, as it (30)_______ a species more valuable and more desirable for collectors and poachers.The conservation status of a species is an indicator of the (31)_______of that endangered species continuing to survive. Many factors are taken (32)_______ account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.The best-known worldwide conservation status listing is the World Conservation Union Red List. (33)_______ , many more specialized lists existĐiền vào ô số 29

Xem chi tiết 536 lượt xem 5 năm trước

Read the following passage and mark the letter A, B,C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 33.An endangered species is a species (24)_______ population is (25) _______small that it is in danger of becoming extinct. Many countries have laws offering special protection to these species; (26) _______, forbidding hunting (27)_______ banning their sales. Only a few of the many truly endangered species actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially become extinct, without gaining public notice.Many of these laws are (28) _______. Typical areas of controversy include: criteria for placing a species on the endangered species list, and criteria for removing a species (29)_______ the list once its population has recovered.A listing as an endangered species can backfire, as it (30)_______ a species more valuable and more desirable for collectors and poachers.The conservation status of a species is an indicator of the (31)_______of that endangered species continuing to survive. Many factors are taken (32)_______ account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.The best-known worldwide conservation status listing is the World Conservation Union Red List. (33)_______ , many more specialized lists existĐiền vào ô số 28

Xem chi tiết 638 lượt xem 5 năm trước

Read the following passage and mark the letter A, B,C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 33.An endangered species is a species (24)_______ population is (25) _______small that it is in danger of becoming extinct. Many countries have laws offering special protection to these species; (26) _______, forbidding hunting (27)_______ banning their sales. Only a few of the many truly endangered species actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially become extinct, without gaining public notice.Many of these laws are (28) _______. Typical areas of controversy include: criteria for placing a species on the endangered species list, and criteria for removing a species (29)_______ the list once its population has recovered.A listing as an endangered species can backfire, as it (30)_______ a species more valuable and more desirable for collectors and poachers.The conservation status of a species is an indicator of the (31)_______of that endangered species continuing to survive. Many factors are taken (32)_______ account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.The best-known worldwide conservation status listing is the World Conservation Union Red List. (33)_______ , many more specialized lists existĐiền vào ô số 27

Xem chi tiết 522 lượt xem 5 năm trước

Read the following passage and mark the letter A, B,C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 33.An endangered species is a species (24)_______ population is (25) _______small that it is in danger of becoming extinct. Many countries have laws offering special protection to these species; (26) _______, forbidding hunting (27)_______ banning their sales. Only a few of the many truly endangered species actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially become extinct, without gaining public notice.Many of these laws are (28) _______. Typical areas of controversy include: criteria for placing a species on the endangered species list, and criteria for removing a species (29)_______ the list once its population has recovered.A listing as an endangered species can backfire, as it (30)_______ a species more valuable and more desirable for collectors and poachers.The conservation status of a species is an indicator of the (31)_______of that endangered species continuing to survive. Many factors are taken (32)_______ account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.The best-known worldwide conservation status listing is the World Conservation Union Red List. (33)_______ , many more specialized lists existĐiền vào ô số 26

Xem chi tiết 364 lượt xem 5 năm trước

Read the following passage and mark the letter A, B,C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 33.An endangered species is a species (24)_______ population is (25) _______small that it is in danger of becoming extinct. Many countries have laws offering special protection to these species; (26) _______, forbidding hunting (27)_______ banning their sales. Only a few of the many truly endangered species actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially become extinct, without gaining public notice.Many of these laws are (28) _______. Typical areas of controversy include: criteria for placing a species on the endangered species list, and criteria for removing a species (29)_______ the list once its population has recovered.A listing as an endangered species can backfire, as it (30)_______ a species more valuable and more desirable for collectors and poachers.The conservation status of a species is an indicator of the (31)_______of that endangered species continuing to survive. Many factors are taken (32)_______ account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.The best-known worldwide conservation status listing is the World Conservation Union Red List. (33)_______ , many more specialized lists existĐiền vào ô số 25

Xem chi tiết 490 lượt xem 5 năm trước

Read the following passage and mark the letter A, B,C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 33.An endangered species is a species (24)_______ population is (25) _______small that it is in danger of becoming extinct. Many countries have laws offering special protection to these species; (26) _______, forbidding hunting (27)_______ banning their sales. Only a few of the many truly endangered species actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially become extinct, without gaining public notice.Many of these laws are (28) _______. Typical areas of controversy include: criteria for placing a species on the endangered species list, and criteria for removing a species (29)_______ the list once its population has recovered.A listing as an endangered species can backfire, as it (30)_______ a species more valuable and more desirable for collectors and poachers.The conservation status of a species is an indicator of the (31)_______of that endangered species continuing to survive. Many factors are taken (32)_______ account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.The best-known worldwide conservation status listing is the World Conservation Union Red List. (33)_______ , many more specialized lists existĐiền vào ô số 24

Xem chi tiết 412 lượt xem 5 năm trước

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsMany ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.According to the passage, the highest amount of pheromone vapor is found

Xem chi tiết 584 lượt xem 5 năm trước

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsMany ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.According to the passage, how are ants guided by trail pheromones?

Xem chi tiết 382 lượt xem 5 năm trước

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsMany ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.The author mentions the trail pheromone of the leafcutter ant in paragraph 2 to point out

Xem chi tiết 758 lượt xem 5 năm trước

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsMany ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.According to the passage, why do ants use different compounds a trail pheromones?

Xem chi tiết 664 lượt xem 5 năm trước

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsMany ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.The phrase “the one” in paragraph 2 refers to a single

Xem chi tiết 442 lượt xem 5 năm trước

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsMany ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.The word “intermittently” in paragraph 1 is closest in meaning to

Xem chi tiết 878 lượt xem 5 năm trước

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.What does the passage mainly discuss?

Xem chi tiết 435 lượt xem 5 năm trước