Scientists are convinced the positive effect of laughter physical and menta

题型：不详难度：来源：

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

A．of; at

B．by; in

C．of; on

D．on; at

答案

解析

be convinced of 确信。effect on……，有关于------方面的影响。

举一反三

When she first arrived in China, she wondered what the future might have_______ for her, but now all her worries are gone.

A．in need

B．in time

C．in preparation

D．in store

题型：不详难度：| 查看答案

-How amazing it is that astronauts are exploring outer space!
-It’s a challenge, I guess, _________man against nature.

A．of

B．for

C．by

D．about

题型：不详难度：| 查看答案

－When do we need to pay the balance?

－__________ September 30.

A．In

B．By

C．During

D．Within

题型：不详难度：| 查看答案

--- Why do you suggest we buy a new machine?

--- Because the old one has been damaged ___________.

A．beyond reach

B．beyond repair

C．beyond control

D．beyond description

题型：不详难度：| 查看答案

I began to feel _____ in the new school when I saw some families faces.

A．at home

B．at heart

C．at will

D．at sight

题型：不详难度：| 查看答案