题目内容

Our knowledge of dinosaurs is whollyfrom the bones that have been found here and there buried in the ground.

A. acquired
B. retained
C. absorbed
D. sought

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She wandered whether triangles, which had only three sides, wereas polygons, which she thought of as many-sided.

A. qualified
B. theorized
C. estimated
D. multiplied

There is no perfect trading system, and each of the proposed ones has its.

A. limits
B. borders
C. frontiers
D. limitations

Henry will not be able to attend the meeting tonight becausea class then.

A. he must be teaching
B. he will be teaching
C. he will have taught
D. of him has to teach

I wish I hadn't been so busy yesterday, otherwise Iyou with the cleaning.

A. will have helped
B. should help
C. could have helped
D. could help

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