—WhatdoesPM2.5mean?—Itsaprofes

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—What does PM2.5 mean?
—It's a professional ________ indicating the condition of air pollution.

A．term	B．item
C．number	D．mark

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In the market,vegetables are sold by_________ kilogram,I mean,by _________ weight.

A．the;不填	B．不填；不填
C．the;the	D．不填；the

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________he will come to help us is not clear.

A．That

B．Whether

C．Either

D．What

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—Did you get a ticket?
—No,I_________,but there wasn’t any left.

A．had to	B．attempted to
C．decided to	D．managed to

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_________he said so surprised all of us.

A．That

B．What

C．When

D．不填

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.He told me he had been offered a very well-paid_________ abroad.

A．service	B．business
C．position	D．work

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