thatcausesheavyhazesweepingove

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_________ that causes heavy haze sweeping over china remains unknown to many scientists.

A．what it is	B．what is it
C．who is it	D．who it is

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相关试题

--- They are quiet, aren’t they?
--- Yes. They are accustomed ____________ at meals.

A．to talk

B．to not talk

C．to talking

D．to not talking

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--- 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

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It is often said that the joy of traveling is __________ in arriving at your destination ___________ in the journey itself.

A．/ … but

B．/ … or

C．not … or

D．not … but

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--- It shouldn’t take long to clear up after the party if we all volunteer to help.
--- That’s right. _____________.

A．Many hands make light work	B．Something is better than nothing
C．The more, the merrier	D．The sooner begin, the sooner done

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--- I can’t repair these until tomorrow, I’m afraid.
--- That’s OK, there’s ____________.

A．no problem

B．no wonder

C．no doubt

D．no hurry

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