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问题 多项选择题

患者，女，金瓷全冠固定桥，粘固后3出现龈缘均出现发红、肿胀，可能的原因（）

A.龈组织受压

B.接触点不正确

C.冠形态不正确

D.牙石形成

E.粘结剂刺激

答案

参考答案：A, B, C

单项选择题 A1/A2型题

下列对逆转录病毒形态与结构描述不正确的是（）

A.病毒颗粒呈二十面体立体对称的球形，直径为27nm左右

B.P24蛋白构成病毒衣壳

C.病毒外层包有脂蛋白包膜，并嵌有gP120和gP41糖蛋白

D.病毒衣壳内有两条正链RNA基因组，呈双聚体形式

E.病毒核心部分含有其进行复制的蛋白酶、整合酶和逆转录酶
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填空题

Part 3


Questions 19-25


·Read the following passage and choose the correct answer from A, B, C and D.
More and more, the operation of our businesses, government, and financial institutions are controlled by information that exists only inside computer memories. Anyone clever enough to modify this information for his own purpose can reap substantial rewards. Even worse, a number of people who have done this and been caught by it have managed to get away without punishment.
It is easy for computers crime to go undetected if no one checks up what the computer is doing. But even if the crime is detected, the criminal may walk away not only unpunished but with a growing recommendation from his former employers.
Of course, we have no statistics on crimes that go undetected. But it is disturbing to note how many of the crimes we do know about were detected by accident, not by systematic inspections or other security procedures. The computer criminals who have been caught may have been the victims of uncommon bad luck.
For example, a certain keypunch operator complained of having to stay overtime to punch extra cards. Investigating revealed that the extra cards she was being asked were for dishonest transactions. In another case, dissatisfied employees of the thief tipped off the company that has been robbed.
Unlike other lawbreakers, who must leave the country, commit suicide or go to jail, computer criminals sometimes escape punishment, demanding or not only that they not be charged but that they be given good recommendations and perhaps other benefiting, their demands have been met.
Why Because company executives are afraid of the bad publicity that would result if the public found out that their computer had been misused. They hesitate at the thought of a criminal boasting in open court of how he juggled the most confidential records right under the noses of the company’s executives, accountants, and security staff. And so another staff computer criminal departs with just the recommendation he needs to continue his crime elsewhere.

It can be concluded from the passage that ______.

A．people commit computer crimes at the request of their parents

B．it is still impossible to detect computer crimes today

C．computer crimes are the most serious problem of financial institutions

D．computer criminals can escape punishment because they can’t be detected
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