Read the passage carefully. Biological diversity has become widely recognized as a
Read the passage carefully.
Biological diversity has become widely recognized as a critical conservation issue only in the past two decades. The rapid destruction of the tropical rain forests, which are the ecosystems with the highest known species diversity on Earth, has awakened people to the importance and fragility of biological diversity. The high rate of species extinctions in these environments is jolting, but it is important to recognize the significance of biological diversity in all ecosystems. As the human population continues to expand, it will negatively affect one after another of Earth's ecosystems. In terrestrial ecosystems and in fringe marine eco common problem is habitat destruction. In most situations, the result is irreversible. Now humans are beginning to destroy marine ecosystems through other types of activities, such as disposal and runoff of poisonous waste; in less than two centuries, by significantly reducing the variety of species on Earth, they have irrevocably redirected the course of evolution.
Certainly, there have been periods in Earth's history when mass extinctions have occurred. The extinction of the dinosaurs was caused by some physical event, either climatic or cosmic. There have also been less dramatic extinctions, as when natural competition between species reached an extreme conclusion. Only 0.01 percent of the species that have lived on Earth have survived to the present, and it was largely chance that determined which species survived and which died out.
However, nothing has ever equaled the magnitude and speed with which the human species is altering the physical and chemical world and demolishing the environment. In fact, there is wide agreement that it is the rate of change humans are inflicting, even more than the changes themselves that will lead to biological devastation. Life on Earth has continually been in flux as slow physical and chemical changes have occurred on Earth, but life needs time to adapt-time for migration and genetic adaptation within existing species and time for the proliferation of new genetic material and new species that may be able to survive in new environments.
Trả lời cho các câu 1, 2, 3, 4, 5, 6, 7 dưới đây:
The author mentions all of the following as examples of the effect of humans on the world's ecosystems EXEPT ______________.
Đáp án đúng là: A
Đang cập nhật …
Đáp án cần chọn là: A
The word “magnitude” in paragraph 3 mostly means____________.
Đáp án đúng là: C
Đang cập nhật …
Đáp án cần chọn là: C
Which of the following statements would the author be most likely to agree with?
Đáp án đúng là: B
Đang cập nhật …
Đáp án cần chọn là: B
What does the word “they” in paragraph I refers to?
Đáp án đúng là: D
Đang cập nhật …
Đáp án cần chọn là: D
The word “jolting” mostly means___________.
Đáp án đúng là: C
Đang cập nhật …
Đáp án cần chọn là: C
What can be inferred from the extinction of the dinosaurs in paragraph 2?
Đáp án đúng là: A
Đang cập nhật …
Đáp án cần chọn là: A
What does the passage mainly discuss?
Đáp án đúng là: D
Đang cập nhật …
Đáp án cần chọn là: D
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