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问题

Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.

A:of;on
B:by;in
C:of;at
D:on;at;
正确答案是:
同类题型

24Is it the years ____you worked in the factory____ have a great effect on your literary works?

7.You should try to_____new circumstances as quickly as you can

Don’t forget to ______ the lights and the TV in the sitting room before going to bed.

The reason__________ their failure you know is__________ they didn’t get fully prepared for the experiment.

Tom looks nervous.— So youif you had so fierce a competition.

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