—Whydoyoulooksopuzzled?—Oh，Iov

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—Why do you look so puzzled?
—Oh，I ________ over a most difficult maths problem.

A．thought	B．have thought
C．am thinking	D．think

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_______ that we can't get the necessary equipment, we will have to give up the
experiment.

A．To assume

B．Assume

C．Assumed

D．Assuming

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Attackers in China’s Xinjiang region crashed two cars into shoppers at a market in May, 31 people.

A．killed	B．to kill
C．killing	D．being killed

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-----How dangerous it was !
-----Yes, but for the young man’s quick action, he run over by the car.

A．should have been	B．would be
C．could have been	D．might be

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Chemical pollution will bring about a threat to agriculture and food chain, and
to human health.

A．frequently	B．significantly
C．steadily	D．consequently

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By the year of 2053 there will be 487 million aged people in China， means that one third of the population will be over 60.

A．that

B．which

C．what

D．where

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