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问题 多项选择题

下列关于Windows9X对话框的叙述中，正确的是（）。

A.对话框是提供给用户与计算机对话的界面

B.对话框的位置可以移动，但大小不能改变

C.对话框的位置和大小都不能改变

D.对话框中可能会出现滚动条

答案

参考答案：A, B, D

单项选择题

The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, (51) this is largely because, unlike animals, we stand upright. This means that our noses are (52) to perceiving those smells which float through the air, missing the majority of smells which stick to surfaces. In fact, (53) , we are extremely sensitive to smells, even if we do not generally realize it. Our noses are capable of (54) human smells when these are diluted to far below one part in one million.

Strangely, some people find that they can smell one type of flower but not another, (55) others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate (56) smell receptors in the nose. These receptors are the cells which sense smells and send (57) to the brain. However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when (58) to it often enough.

The explanation for insensitivity to smell seems to be that the brain finds it (59) to keep all smell receptors working all the time but can (60) new receptors if necessary.

54().

A.distinguishing 

B.discovering 

C.determining 

D.detecting
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单项选择题

脱丙烷塔塔底热源大幅增加，（）操作没有改变，会引起脱丙烷塔塔顶压力超高。

A、塔底抽出量

B、塔顶抽出量

C、塔顶回流量

D、进料量
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