Althoughthecausesofcancer,wedo

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Although the causes of cancer_____, we do not yet have any practical way to prevent it.

A．are being uncovered	B．have been uncovering
C．are uncovering	D．have uncovered

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It took _____building supplies to construct these energy-saving houses. It took brains,too.

A．other than

B．more than

C．rather than

D．less than

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He said to us that he ____the teacher’s instructions.

A．must follow	B．followed
C．follow	D．must have followed

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I hear a number of workers in the factory_____out of work.
__Yes, and the number _____quite huge.

A．are; is

B．is; are

C．is; is

D．are; are

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More than one child _____to the cave to see the strange animal.

A．have gone

B．are gone

C．has been

D．is been

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To improve your spoken English, you’d better listen to the tape ______.

A．generally

B．fluently

C．frequently

D．gradually

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