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For years scientists have been worried about the ______ of air pollution on the earth's natural conditions.

A．effect	B．result
C．account	D．cause

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______ that we all think it worth the money.

A．Such fine furniture has he bought	B．So fine a furniture has he bought
C．Such fine furniture he has bought	D．So fine a furniture he has bought

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______ to computer games, he had no time to go over his lessons. As a result, he failed in all subjects.

A．Addicting	B．Being addicted
C．Having addicted	D．Addicted

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---- Did he give you advice on your work yesterday?
---- Yes. But his advice, as a matter of fact, ______ my difficulty.

A．used to	B．related to
C．added to	D．belonged to

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Mountain climbing ______ be really dangerous at times even though it is challenging and exciting in general.

A．can

B．should

C．shall

D．must

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The music, ____________ pleasant, was soon well received when it was taken to the stage.

A．sounded

B．being sounded

C．sounding

D．having sounded

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