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问题 单项选择题

自动编号数据类型一旦被指定，就会永久地与下列哪一项进行连接( )。

A．字段

B．记录

C．表

D．数据库

答案

参考答案：B

解析： 本题考查Access中的自动编号数据类型。它是在添加记录时自动插入惟一顺序号 (每次递增1)或随机编号。自动编号数据类型一旦被指定，就会永久地与记录连接在一起，即使记录被删除，该条记录的自动编号型字段值也不会被再次使用。答案为B。

单项选择题

When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of affliction and find ways to combat. Vaccination is one of the effective ways to protect the (1) population of a region or country which may be (2) grave risk. The process of vaccination allows the patient’s body to (3) immunity to the virus or disease so that, if it is encountered, one can fight it (4) naturally. To accomplish this, a small weak or dead (5) of the disease is actually injected into the patient in a controlled environment, (6) his body’s immune system can learn to fight the invader (7) . Information (8) how to penetrate the disease’s defenses is (9) to all elements of the patient’s immune system in a process that occurs naturally, in which genetic information is passed from cell to cell. This makes sure that (10) the patient later come into contact with the real problem, his body is well equipped and trained to (11) with it, having already done so before.

There are, however, dangers (12) in the process. (13) , even the weakened version of the disease contained in the vaccine proves (14) much for the body to handle, resulting in the immune system (15) , and, therefore, the patient’s death. Such is the case of the smallpox vaccine, (16) to eradicate the smallpox epidemic that nearly (17) the whole Native American population and killed massive numbers of settlers. (18) 1 in 10,000 people who receive the vaccine (19) the smallpox disease from the vaccine itself and dies from it. Consequently, the process, which is truly a (20) , may indeed hide some hidden curses.

5（）

A.strain

B.spell

C.series

D.fit
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单项选择题

在人寿保险合同中，由于保险标的的特殊性，保险公司所采取的承保方式是( )。

A．定额保险方式

B．不定值保险方式

C．定值保险方式

D．不定额保险方式
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