Foryearsscientistshavebeenworr

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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相关试题

Jack has been working hard these days．It's obvious that there is ________he is eager for but didn't mention to us．

A．anything

B．something

C．nothing

D．everything

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With the on－going campaign of banning cigarette，the number of people who have given up smoking________．

A．is increasing	B．increased
C．has increased	D．will increase

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The video，Gangnam Style，is becoming the first video________ more than one billion views．

A．got

B．getting

C．to get

D．gets

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The problem is so complex that I'm afraid it will take me several hours to________．

A．figure out	B．set out
C．break out	D．put out

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The newlylearnt words will be impressed on us only if they are ________used in everyday communication．

A．gradually	B．accurately
C．familiarly	D．frequently

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