6.I would never have encouraged you to go into this field _____ it would be so hard for you.

A. had I known

B. and I had known

C. should I know

D. but I knew

答案: A

详解：应选A项。此句为虚拟语气，如果条件从句中包含有一个助动词，可把if省略，这时助动词应放在主语前面。句意为：要是我知道这件事情对你如此之难，我就不会鼓励你进入这个领域。

7.Reading is to the mind _____ food is to the body.

A. what

B. that

C. similar

D. which

答案: A

详解：应选A项。what是关系代词，A is to B what C is to D，A对于B之间的关系犹如C对于D。句意为：读书对于大脑来说就像食物对于身体一样。

8.Are there any other factors that might affect the development of a child ______ education and innate inability?

A. apart from

B. away from

C. far from

D. but for

答案: A

详解：应选A项。apart from除……之外，away from远离，far from 远非，but for要不是。句意为：除了教育和先天的不足，还有什么其他因素会影响一个孩子的发展?

9.We drive our car fast and soon _____ other cars on the road.

A. oversee

B. overtake

C. overrun

D. override

答案: B

详解：我们开得很快，一会儿就超越了公路上的其他汽车。overtake“追上，赶上，超过”。oversee“俯瞰;监督，监视”。overrun“溢出;(侵略军)横行于”。override“奔越过，践踏过;制服，压倒”。

10.Professor Black and professor Smith will _____ in giving the class lectures.

A. alter

B. change

C. alternate

D. differ

答案: C

详解：答案为C。alternate指“交替”;alter指“改变”。

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