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No scientists can exactly figure out what ________ happened ________ at that time, which caused the extinction of the dinosaurs.

A．on earth; on the earth

B．on the earth; on earth

C．on earth; on earth

D．on the earth; on the earth

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The price in different countries will be based________and local economic conditions.

A．in advance

B．in conclusion

C．on demand

D．at all costs

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It was a long time before the police________what he was really doing.

A．caught hold of

B．caught up

C．caught on to

D．caught at

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Lan Lan _______her pace of walking home fearing that it was going to rain.

A．accelerated

B．slowed

C．stopped

D．returned

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People believe that we ______a special ability to learn language and that our brain _____ itself to the language we hear.

A．are prepared for；adjusts	B．are equipped for；adapts
C．are armed by；fits	D．are equipped with；adjusts

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It is immediately obvious that water is to be _______ to the development of life.

A．compulsory

B．controversial

C．fundamental

D．supreme

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