单项选择题

We should make a clear （）between the two scientific terms for the purpose of our discussion.

A. distinction
B. discrimination
C. deviation
D. separation

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单项选择题
Crime is increasing worldwide, and there is every reason to believe the （）will continue into the next decade.

A. emergency
B. trend
C. pace
D. schedule
单项选择题
Scientists have spent years into the effects of certain chemicals on the human brain, but with no result（）

A. studying
B. researching
C. investigating
D. inspecting
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