Question

 IV.Choose the correct answer from the four options marked A,B,C or D to complete each of the numbered blanks in the following passage.

WHY DO ANIMALS GO EXTINCT?

Different kinds (18)…………animals have appeared and disappeared throughout Earth’s history. Some animals go extinct (19)………the climate where they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or (20) ……… to the new climate, they die.Some animals go extinct because they cannot (21)………. with other animals for food. Some animals go extinct because they are killed by enemies. New kinds of animals are always evolving. Evolving(22)……..that the animals are changing slowly from generation (23)…………generation. Small differences between parents,children, (24)……… grandchildren slowly add up over many, many generations. Eventually,a different kind of animal evolves. Sometimes, many of the animals on Earth go extinct at the (25)………time. Scientists call this a mass extinction. Scientists think there have been at least five mass extinctions in Earth’s history. The (26)………mass extinction happened about 65 million years ago. This mass extinction killed off

the dinosaurs.
18.	A. in	B. of	C. on	D. with
19.	A. because	B. when	C. while	D. because of
20.	A. live	B. find	C. adapt	D. exist
21.	A. complete	B. beat	C. win	D. compete
22.	A. says	B. proves	C. means	D. appears
23.	A. in	B. too	C. into	D. onto
24.	A. and	B. or	C. with	D. of
25.	A. similar	B. same	C. different	D various
26.	A. end	B. only	C. last	D. finally