We must do something to ________ the factories sending out poisonous gases so as

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We must do something to ________ the factories sending out poisonous gases so as to keep the city clean and beautiful.

A．keep

B．protect

C．permit

D．prevent

答案

解析

略

举一反三

13. English we must work hard at it.

A．So as to master

B．Mastering

C．Mastered

D．To master

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2. Why did Jane go to Africa to study chimps in the wild? Because she wanted .

A．to work with them in their own environment
B．to prove the way people think about chimps was wrong
C．to discover what chimps eat	D．to observe a chimp family

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2.Operations which left patients and in need of long periods of recovery time now leave
them feeling relaxed and comfortable.

A．exhausted

B．injured

C．ridiculous

D．delighted

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4. Have you heard of the town when they built the dam?

A．submerge

B．submerging

C．being submerged

D．submerged

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5. China has made great progress in the sun’s rays as a source of energy.

A．harness

B．harnessing

C．harvest

D．harvesting

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