Itisprettywellunderstoodcontro

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It is pretty well understood controls the flow of carbon dioxide in and out the atmosphere today.

A．that

B．when

C．what

D．how

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Leave it to me! I feel more about myself and my abilities these days.

A．confident

B．curious

C．sensitive

D．worried

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The difficulty which we had _______ with the local people has now been removed·

A．communication	B．to communicate
C．communicated	D．communicating

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The surface of the table ______ smooth enough．

A．hash’t felt

B．isn’t feeling

C．doesn’t feel

D．isn’t felt

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At last，we found ourselves in a pleasant park ________trees providing shade(荫凉)and sat down to eat our picnic lunch．

A．for

B．from

C．of

D．with

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.Manufacturers should have professional productivity and technical knowledge to ______ the quality of the products.

A．predict

B．promise

C．guarantee

D．determine

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