题目内容

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

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

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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

Hosts and guests were matched up by Airbnb, a firm _________in San Francisco.【CET-4 真题】

A. based
B. basic
C. barrier
D. bask

I couldn't _________ to spend three hours sitting in a train every day.【CET-4 真题】

A. base
B. ban
C. bargain
D. bear

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