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Every possible means ___ to prevent the air pollution, but the sky is still not clear．

A．is used

B．are used

C．has been used

D．have been used

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The environmentalists said wild goats’______ on the vast grasslands was a good indication of the better environment.

A．escape

B．absence

C．attendance

D．appearance

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Usually a child's behavior is a ________ of his family environment.

A．recognition

B．reflection

C．return

D．record

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I have read the material several times but it doesn't make any ________ to me.
A meaning B. importance C. sense D. significance

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Don’t leave matches or cigarettes on the table within ______of little children.

A．hand

B．reach

C．space

D．distance

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I keep medicines on the top shelf, out of the children’s________.

A．reach

B．hand

C．hold

D．place

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