Câu hỏi:
01/04/2020 291Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions
It is estimated that over 99 percent of all species that have existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species' death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.
The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions, many species became extinct at the same time- a mass extinction. One of the best-known examples of mass extinction occurred 65 mmion years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when approximately 95 percent of all species died. Mass extinction can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affecting even organisms not living in the oceans. Such a change would probably lead to a mass extinction.
One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intensive every 26 million years. This periodic extinction might be due to intersection of the Earth's orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species' survival may have nothing to do with its ability or inability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.
What does the author say in paragraph 1 regarding most species in Earth's history?
Đáp án chính xác
Câu hỏi trong đề:
ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH !!
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
Kiến thức: Đọc hiểu
Giải thích:
Ở đoạn 1, tác giả đã nói gì liên quan đến sinh vật trong lịch sử Trái đất ?
A. Họ đã có thể thích nghi với những thay đổi sinh thái.
B. Chúng đã gây ra những thay đổi nhanh chóng trong môi trường.
C. Về cơ bản chúng vẫn không thay đổi so với dạng ban đầu của chúng.
D. Chúng không còn tồn tại.
Thông tin: It is estimated that over 99 percent of all species that ever existed have become extinct.
Tạm dịch: Ước tính được rằng, có khoảng hơn 99 phần trăm các loài sinh vật đang tồn tại có nguy cơ tuyệt chủng.
Chọn D
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 correct answer to each of the following questions.
We _______ in silence when he suddenly ________ me to help him.
Xem đáp án »
01/04/2020
71,322
Câu 2:
The Complex of Hue Monuments was the first site in Viet Nam ________ as a World Heritage Site by UNESCO.
Xem đáp án »
01/04/2020
58,026
Câu 3:
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.
Though built almost five hundred years ago, the church remained practically intact.
Xem đáp án »
01/04/2020
46,851
Câu 4:
Any pupil caught ________ was made to stand at the front of the class.
Xem đáp án »
01/04/2020
45,787
Câu 5:
Next year, I have to decide which area of medicine I want to ________ in.
Xem đáp án »
01/04/2020
37,544
Câu 6:
Being helpful is good, but don't allow others to _______ advantage of your generosity.
Xem đáp án »
01/04/2020
33,452
Câu 7:
Is it acceptable to touch ______ person on _______ shoulder in a conversation?
Xem đáp án »
01/04/2020
29,210
về câu hỏi!