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问题 单项选择题 A1/A2型题

Nagler反映原理是产气荚膜梭菌（）

A.分解葡萄糖产酸产气

B.分解乳糖产酸产气

C.分解蛋黄中卵磷脂

D.分解蛋黄中胆固醇

E.液化明胶

答案

参考答案：C

解析：本题考查Nagler反应原理。产气荚膜梭菌在卵黄琼脂平板上由于产生α毒素分解卵黄中的卵磷脂而致菌落周围出现乳白色混浊圈，若在培养基中加入α毒素的抗血清则不出现混浊，这种现象称Nagler反应。

单项选择题

Part I Reading ComprehensionDirections: There are three reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four suggested answers marked A, B,C and D.Choose the best answer to each question.Questions 1 to 5 are based on the following passage: ( 10 分 )Every artist knows in his heart that he is saying something to the public. Not only does he wantto say it well,but he wants it to be something which has not been said before. He hopes the publicwill listen and understand--he wants to teach them, and he wants them to learn from him. Whatvisual artists like painters want to teach is easy to make out but difficult to explain, because painterstranslate their experiences into shapes and colors, not words. They seem to feel that a certainselection of shapes and colors, out of the countless billions possible, is exceptionally interesting forthem and worth showing to us. Without their work we should never have noticed these particularshapes and colors, or have felt the delight which they brought to the artist. Most artists take theirshapes and colors from the world of nature and from human bodies in motion and repose; theirchoices indicate that these aspects of the world are worth looking at, that they contain beautifulsights. Contemporary artists might say that they merely choose subjects that provide an interestingpattern, that there is nothing more in it. Yet even they do not choose entirely without reference to thecharacter of their subjects. If one painter chooses to paint a gangrenous (生坏疽的) leg and another alake in moonlight, each of them is directing our attention to a certain aspect of the world. Eachpainter is telling us something, showing us something, emphasizing something---all of which meanthat, consciously or unconsciously, he is trying to teach us.

A painter chooses certain shapes and colors out of the countless billions possible because he believes they （ ）

A．are beautiful

B．can bring delight to him

C．are worth showing to the public

D．are particular
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单项选择题

设计时有（）要求的管道，需向电气专业人员提供要求避雷管道位置、管径大小等资料。

A．特殊 

B．明确 

C．隔热 

D．避雷
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