问题 单项选择题

DHCP客户端启动时会向网络发出一个dhcpdiscover包来请求IP地址,其源IP地址为______。

A.192.168.0.1
B.0.0.0.0
C.255.255.255.0
D.255.255.255.255

答案

参考答案:B

解析: 当DHCP客户端第一次登录网络的时候,也就是客户发现本机上没有任何IP数据设定,它会向网络发出一个DHCP DISCOVER封包。因为客户端还不知道自己属于哪一个网络,所以封包的来源地址会为0.0.0.0,而目的地址则为255.255.255.255,然后再附上DHCP discover的信息,向网络进行广播。

阅读理解

Where have all the boys gone?You may be able to find them in the gym, at work or hanging out, but there’s one important place where boys are under­represented, and the problem seems to be getting worse. These days, at high school graduation ceremonies, there are a lot more girls than boys.

In fact, every year, 10 percent more girls graduate from high school than boys. “I think that there’s a tendency to focus on boys as problems at this point, rather than recognize that boys have problems,” says Joanne Max, PhD. Experts say the problems start in grade school, where there’s often an emphasis on sports instead of reading, for example. “I think that with boys there’s some idea that it’s not masculine(男子汉的)to read,” says Rob Jenkins, an English professor.

There’s also a shortage of male teachers as role models. “I think boys need role models, so if you’re a boy and you don’t have a dad in your home and then you have one male teacher and it’s your athletic coach then I don’t think you have a message that education is very important,” says Carol Carter, another expert. In addition, classrooms often have too little activity and too much passive listening, which is not conducive(有益的)to boys’ learning.

Experts say parents can fight back in many ways. Read to your sons early and often; show by your actions that you value their education. Ask them about their schoolwork, offer help, drop by their classroom and finally, appeal to their competitive spirit: challenge them to do better and help them understand that their future depends on it.

小题1:The underlined part “one important place” in Paragraph 1 refers to “______”.

A.classrooms

B.factories

C.high school graduation ceremonies

D.gyms小题2:According to the passage,boys have the problem that they think ______.

A.reading is more important than sports

B.it is shameful for boys to read

C.boys should not work as a teacher

D.boys lack the gift for reading小题3:Carol Carter’s words implied that ______.

A.parents play an important role in education

B.athletic coaches contribute a lot to education

C.lack of male teachers affects boys’ attitudes to school work

D.classrooms lack enough activities that are suitable for boys小题4:According to experts,parents should do the following except ______.

A.often read to their sons when they are young

B.keep an eye on their sons’ studies at school

C.encourage their sons to compete with others

D.prevent their sons from taking part in sports

单项选择题