ThescientistsinChinaaretryingt

The scientists in China are trying __________ the ways to reduce the fog and haze (减少雾霾)．

A．look for	B．to look for
C．to find out	D．find out

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A．has	B．in
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A．Close s	B．Close
C．Closing	D．To close

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A．in	B．on
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A．a, a	B．a, an
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A．Thank you	B．Ok
C．All right	D．No problem

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