题目内容

He ________ your car by mistake because he didn't have the keys.

A．mustn't have taken B．shouldn't have taken

C．couldn't have taken D．needn't have taken

 

【解析】从语意“他不可能误开了你的车，因为他没有钥匙”可知，此处应选择couldn't have taken。

 

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I ________ it as a basic principle of the company that suppliers of raw materials should be given a fair price for their products.

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A．the；the B．a；a C．a；the D．the；a

 

(2013·浙江，15)People develop ________ preference for a particular style of learning at ________ early age and these preferences affect learning.

A．a；an B．a；/ C．/；the D．the；an

 

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A．must B．may C．need D．shall

 

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But most people don't know that when they practice and learn new things，parts of their brain change and get larger a lot like muscles do when they exercise. Inside the cortex(皮层)of the brain are billions of tiny nerve cells，called neurons. The nerve cells have branches connecting them to other cells in a complicated network. Communication between these brain cells is what allows us to think and solve problems. When you learn new things，these tiny connections in the brain actually multiply and get stronger.The more you challenge your mind to learn，the more your brain cells grow.Then，things that you once found very hard or even impossible to do—like speaking a foreign language or doing algebra(代数)—seem to become easy after learning them for a period of time.The result is a stronger，smarter brain.

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A．the function of our brain is like that of the muscle

B．until now it's impossible to explain the brain's mystery

C．many people believe one's intelligence is naturally determined

D．one's brain grows stronger as the age increases

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A．using the brain

B．connecting things in your brain

C．lifting weights

D．doing research about the brain

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A．Strong. B．Smart.

C．Popular. D．Active.

4.The following paragraph will most probably talk about ________.

A．the differences between animals'brains and humans'brains

B．the relation between human brains and muscles

C．scientists' findings about animals' brains

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D．operating machines at home

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We'll have a picnic in the park this Sunday ________ it rains or it's very cold.

A．since B．if C．unless D．until

 

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