题目内容

The above discussion has______the rise of US imperialism at the expense of its competitors.

A. centered on
B. centered at
C. centered towards
D. centered for

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How many TV sets have they exported to Europe this year？

A. 30，000
B. 60，000
C. 90，000

In some parks visitors are requested to______the grass.

A. keep off
B. keep aside
C. keep out
D. keep away

We have been considering taking a trip to Europe______.

A. at times
B. for all time
C. some time ago
D. for some time

A．sweetB．healthyC．commonD．special

A. sweet
B. healthy
C. common
D. special