Children’sbrainscannotdevelopp

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Children’s brains cannot develop properly _________ they lack protein.

A．because	B．since
C．when	D．unless

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21._____by a desire to learn, he was not interested in children’s play and adventure when he was young.

A．Driven

B．Driving

C．To drive

D．To be drive

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20. The flu is believed________by viruses.

A．causing

B．being caused

C．to be caused

D．to cause

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19. They________a lot of suggestions for improving the workers’ living conditions.

A．put out

B．put forward

C．put on

D．put in

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18. After having gone____-far, I didn’t want to turn back.

A．enough

B．thus

C．that

D．Much

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17. One of the mottos for the park makes_____clear that science and business can and must work together to build the future.

A．them

B．it

C．us

D．This

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