题目内容

The motor car has been responsible for many changes in the environment.

A. 对
B. 错

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I'll have been teaching for thirty years _this July.

A. by
B. on
C. in
D. at

I invited her to dinner _she didn't respond to answer.

A. but
B. and
C. or
D. that

What is the finding of the study?

volunteers' heartbeats when they saw terrible pictures?