试题与答案

要求管理员在网络中的任何位置都能通过在MailSrv上开放的默认Telnet端口登录

题型:单项选择题

题目:

要求管理员在网络中的任何位置都能通过在MailSrv上开放的默认Telnet端口登录MailSrv,实现对MailSrv的配置。因此,需要在防火墙中添加如表7.12所示的规则(*代表P1、P2、P3中的任意一个或几个)。

表7.12 规则
目 的 方向 协议 源端口 目的端口 ACK 行动
Any MailSrv *→P2  (7)   (8)   (9)   (10)  允许
MailSrv Any P2→*  (7)   (9)   (8)   (11)  允许

A.0 B.1 C.0或1

A.0

B.1

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析: 本题主要考查了功能函数的调用。特别要注意的是转换函数Va1的含义。 Va1表示的含义是将字符串转换为数值型,在本题中要求转换为整型值,在转换过程中应用到了四舍五人的规则,Va1(2.54)的结...

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题型:阅读理解

阅读理解

     Popeye the Sailor first became a popular cartoon in the 1930s.The sailor in that cartoon ate lots of

spinach to make him strong. People watched him, and they began to buy and eat a lot more spinach.

Popeye helped sell 33 percent more spinach than before! Spinach became a necessary part of many

people's diets. Even some children who hated the taste began to eat the vegetable.

     Many people thought that the iron in spinach made Popeye strong, but this is not true. Spinach does

not have any more iron than any other green vegetable.

     People only thought spinach had a lot of iron because the people who studied the food made a

mistake. In the 1890s, a group of people studied what was inside vegetables. This group said that

spinach had ten times more iron than it did. The group wrote the number wrong, and everyone accepted

it.

     Today, we know that the little iron there is in spinach cannot make a difference in how strong a person

is. However, spinach does have something else which the body needs-folic acid.

It is interesting to point out that folic acid can help make a person strong. Maybe it was really the folic

acid that made Popeye strong all along.    

1. A good title for this reading passage is______.

A. Popeye the Sailor

B. The Truth About Spinach

C.A Mistake with Numbers

D. Folic Acid Makes You Strong

2. Why did many people eat spinach after they saw Popeye the Sailor?

A. They thought spinach made them strong.

B. They thought Popeye was funny.

C. Spinach had a lot of iron.

D. People liked folic acid.

3. A research group told people that spinach______.

A. made Popeye strong

B. was a green vegetable

C. had less iron than other green vegetables

D. had more iron than other green vegetables

4. The reading passage says that perhaps Popeye got his strength from______.

A. iron

B. folic acid

C. spinach

D. exercise

5. Folic acid is ______.

A. something in food

B. a vegetable

C. dangerous

D. a certain kind of spinach

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