Read 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 from 35 to 42.
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 ecosystems (such as wetlands), the most 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
The word "they" in paragraph 1 refers to _______
A. species
B. centuries
C. activities
D. humans
Giải bởi qa.haylamdo.com
Chọn D
Kiến thức: Đọc hiểu
Giải thích:
Từ “they” ở đoạn 1 liên quan đến ________ .
A. species (n): các loài
B. centuries (n): thế kỷ
C. activities (n): các hoạt động
D. humans (n): con người
Thông tin: 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.
Tạm dịch: Giờ đây, con người đang bắt đầu phá huỷ các hệ sinh thái biển thông qua các hoạt động khác như thải chất thải độc hại; trong ít hơn hai thế kỷ, bằng cách giảm đáng kể sự đa dạng của các loài trên Trái Đất, họ đã chắc chắn chuyển hướng tiến trình tiến hóa
Nowadays more and more students _________ work in mountainous areas in summers.
My uncle, who is an accomplished guitarist, taught me how to play
Although she would have preferred to carry on working, my mum ________ her career in order to have children
He looks for any excuse he can to blow off his _________ to do housework
Malaysia and Indonesia ________ into dumpsites after China had stopped importing their trash
The researchers hope to trial (A) the therapy within the next three years (B) in people with a rare genetic disorder (C) suffering from heart assault (D) in their 30s and 40s.
Telecom giant Viettel decided to implement the 5G network _____ his technology was still uncommon
When I was a child I always looked up to my father. He was a real role model for me.
Britain has accused Russia ________ poisoning the ex-Russian spy Sergei Skripal and his daughter
Linda and Mary are talking about helping the disadvantaged people.
- Linda: "I think we should give care and comfort to the orphan."
- Mary: “__________”
He was appointed to the post. Right after his appointment, he fell ill
I am thankful for my wife, who vowed to be my biggest fan on the day we were married and has never once let me down
