成人英语三级

21. ______ makes men different from the other animals is that they can think and speak.

A.That B. The thing

C. All D. What

22. We’ve tested three hundred types of boot, ______ is completely water-proof.

A.no of which B. none of which

C. some of that D. neither of which

23. He has made another wonderful discovery, ______ of great importance to silence.

A.which I think it is B. of which I think it is

C. I think which is D. which I think is

24. My new glasses cost me _______ the last pair that I bought.

A.three times B. three time as much as

C. thee times as much D. thee times much as

25. The time will come _______ man can fly to outer space freely.

A.that B. when

C. in that D. which

答案：21-25 DBDBB

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