Câu hỏi:
24/03/2020 1,161Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 37.
Pollution is a threat to many species on Earth, but sometimes it can cause species to thrive. Such is the case with Pfiesteria piscicida. A one-celled creature called a dinoflagellate, Pfiesteria inhabits warm coastal areas and river mouths, especially along the eastern United States. Although scientists have found evidence of Pfiesteria in 3,000-year-old sea floor sediments and dinoflagellates are thought to be one of the oldest life forms on earth, few people took notice of Pfiesteria.
Lately, however, blooms – or huge, dense populations – of Pfiesteria are appearing in coastal waters, and in such large concentrations the dinoflagellates become ruthless killers. The blooms emit powerful toxins that weaken and entrap fish that swim into the area. The toxins eventually cause the fish to develop large bleeding sores through which the tiny creatures attack, feasting on blood and flesh. Often the damage is astounding. During a 1991 fish kill, which was blamed on Pfiesteria on North Carolina’s Neuse River, nearly one billion fish died and bulldozers had to be brought in to clear the remains from the river. Of course, such events can have a devastating effect on commercially important fish, but that is just one way that Pfiesteria causes problems. The toxins it emits affect human skin in much the same way as they affect fish skin. Additionally, fisherman and others who have spent time near Pfiesteria blooms report that the toxins seem to get into the air, where once inhaled they affect the nervous system, causing severe headaches, blurred vision, nausea, breathing difficulty, short-term memory loss and even cognitive impairment.
For a while, it seemed that deadly Pfiesteria blooms were a threat only to North Carolina waters, but the problem seems to be spreading. More and more, conditions along the east coast seem to be favorable for Pfiesteria. Researchers suspect that pollutants such as animal waste from livestock operations, fertilizers washed from farmlands and waste water from mining operations have probably all combined to promote the growth of Pfiesteria in coastal waters.
What is true of Pfiesteria?
Đáp án chính xác
Câu hỏi trong đề:
25 Đề thi thpt quốc gia môn Tiếng Anh có lời giải chi tiết !!
Sách mới 2k7: Tổng ôn Toán, Lí, Hóa, Văn, Sử, Địa…. kỳ thi tốt nghiệp THPT Quốc gia 2025, đánh giá năng lực (chỉ từ 110k).
Quảng cáo
Trả lời:
Giải bởi Vietjack
Đáp án A
Điều gì đúng về Pfiesteria?
A. Nó dường như phát triển trong sự hiện diện của các chất ô nhiễm nhất định
B. Nó là mối nguy hại đối với cá và người trong hơn 3000 năm
C. Nó là dạng sống lâu nhất trên trái đất
D. Ở mức độ lớn, nó gây ra mối đe dọa đối với cá nhưng không phải đối với con người
Dẫn chứng: Pollution is a threat to many species on Earth, but sometimes it can cause species to thrive. Such is the case with Pfiesteria piscicida.
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
He asked me _________ Robert and I said I did not know _________.
Xem đáp án »
24/03/2020
47,598
Câu 2:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
_________ some Japanese women are successful in business, the majority of Japanese companies are run by men.
Xem đáp án »
24/03/2020
29,112
Câu 3:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Without _________ all the resources necessary for life would be damaged, wasted or destroyed.
Xem đáp án »
24/03/2020
27,023
Câu 4:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Government have passed laws to _________ protect wildlife from commercial trade.
Xem đáp án »
24/03/2020
22,485
Câu 5:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
No player except the _________ can hold the ball with two hands.
Xem đáp án »
24/03/2020
18,275
Câu 6:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
By 2015, it will be widely accepted that schools and pre-schools have _________extremely important role to play in _________future of our world.
Xem đáp án »
24/03/2020
17,739
Câu 7:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Daisy’s parents don’ t let her go to late - night disco. She _________ be at home at 9 o’clock in the evening.
Xem đáp án »
24/03/2020
17,485
về câu hỏi!