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1 There are a limited number of books on this subject in the library.

A large

B total

C small

D similar

2 Don‘t hesitate to let me know if there is anything I can do for you.

A pause

B refuse

C reject

D wait

3 Merge the following two short sentences into one new sentence.

A Split

B Combine

C Break

D Divide

4 Color changes in chameleons seem to be caused by environmental temperature as well as by other external stimulus.

A have

B appear

C ought

D used

5 Their sole fault was a failure to recognize all the factors involved.

A initial

B maximum

C usual

D only

参考答案：1 C 2 A 3 B 4 B 5 D