221.Thereare5inthepassageabout

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221. There are 5 ________ in the passage about nanometer(纳米) technology we have just read. Please tell me the general meaning of the first one.

A．persons

B．paragraphs

C．articles

D．Units

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_______ that caused him to serve dinner an hour later than usual.

A．It was we being late	B．It was our being late
C．It was we were too late	D．It was because we were late

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China _______ a sharp increase in the number of aged people over the past decade.

A．sees

B．saw

C．has seen

D．will see

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Mr. Frank asked me a question _______ I could go with him to _______ he called the Treasure House the next week.

A．that; which

B．whether; that

C．whether; what

D．that; where

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—The terrible accident is under investigation.
—Actually, quicker action ______ those workers trapped in the mine.

A．might have saved

B．must have saved

C．should have saved

D．could have saved

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— Why didn’t you try to finish the composition?
— I tried to , but I could, the bell rang announcing the end of the examination time.

A．until

B．when

C．before

D．after

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