题目内容

Although they plant trees in this area every year, the tops of some hills are still_【CET-4真题】

A. blank
B. hollow
C. vacant
D. bare

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Some people would like to do shopping on Sundays since they expect to pick up wonderful_____ in the market.【CET-4真题

A. Batteries
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The professor could hardly find sufficient grounds_his arguments in favor of the new theory.【CET-4真题】

A. on which to base
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D. to be based on

Many people think of desert as_________regions,but numerous species of plants and animals have adapted to life there.

A. void
B. virgin
C. barren
D. wretched

Deserts and high mountains have always been a ____________ to the movement of people from place to place. 【CET-4真题】

A. barrier
B. fence
C. prevention
D. jam