Scientistsareconvincedtheposit

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Scientists are convinced _____the positive effect of laughter _____physical and mental health．

A．of ;on

B．by; in

C．of ; at

D．on ;at

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______, tears came to her eyes.

A．Reading the letter

B．While reading the letter

C．As she was reading the letter

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---Mary, I heard there was an explosion in Luzhou. Could you tell me how it _______?
---Sorry, I don’t know much about it either.

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A．to work out	B．working out
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----Do you mind if I record your lecture?
----_______. Go ahead.

A．Never mind

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