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问题 选择题

有人说洋务运动是“有心栽花花不开，无心插柳柳成荫”。这里的“柳”最有可能是指  [ ]

A．使用机器生产

B．诱导了民族资本主义的产生

C．抵制了外国资本主义的扩张

D．引进近代科学技术

答案

答案：B

单项选择题

It is difficult to imagine what life would be like without memory. The meanings of thousands of everyday perceptions, the bases (51) the decisions we make, an d the roots of our habits and skills are to be (52) in our past experiences, which are brought into the present (53) memory.

Memory can be defined as the capacity to keep (54) available for later use. It includes not only "remembering" things like arithmetic or historical facts, but also any change in the way an animal typically behaves. Memory is (55) when a rat gives up eating grain because he has sniffed something suspicious in the grain pile. Memory is also involved when a six-year-old child learns to swing a baseball bat.

Memory (56) not only in humans and animals but also in some physical objects and machines. Computers, for example, contain devices for storing data for later use. It is interesting to compare the memory-storage capacity of a computer (57) that of a human being. The instant-access memory of a large computer may hold up to 100000 "words" —ready for (58) use. An average American teenager probably recognizes the meanings of about 100000 words of English. However, this is but a fraction of the total (59) of information which the teenager has stored. Consider, for example, the number of facts and places that the teenager can recognize on sight. The use of words is the basis of the advanced problem-solving intelligence of human beings. A large part of a person’s memory is in terms of words and (60) of words.

58().

A. progressive

B. instructive

C. instant

D. protective
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单项选择题

六角回转刀架的动作由（）进行控制。

A.换向阀和顺序阀

B.换向阀和溢流阀

C.截止阀和顺序阀

D.截止阀和溢流阀
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