Đề kiểm tra giữa HK2 Tiếng Anh 12 năm 2023-2024 có đáp án - Đề 3. Captoc.vn giới thiệu quý thầy cô và các bạn Đề kiểm tra giữa HK2 Tiếng Anh 12 năm 2023-2024 có đáp án - Đề 3. Tài liệu gồm 04 trang, gồm 40 câu hỏi trắc nghiệm có đáp án, thời gian làm bài 45 phút (không kể thời gian phát đề).

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (25)______ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago.

From what is known about present-day populations and from evolutionary theory, the change in either the physical (26)______ the biological environment is the key to extinction. However, the vulnerability of a species depends on a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those (27)_______ reproduce rapidly. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter how fast an insect species that (28)______ on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed.

It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. (29)______ other 98% have either died out or evolved into something sufficiently different to be called a new species.

Question 25. A. biology B. biologists C. biological D. biologically Question 26. A. so B. and C. nor D. or

Question 27. A. when B. where C. that D. which