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问题 单项选择题

（）是消费者将潜在购买力变为现实购买行为的重要条件。

A.人口

B.购买力

C.购买欲望

D.商品质量

答案

参考答案：C

解析：本题考查市场的要素。购买欲望即人们购买某种产品的需求和欲望，它是消费者将潜在购买力变为现实购买行为的重要条件。

阅读理解

1.How many times did you brush your teeth yesterday?
·Finding：A full 33% of seniors brush their teeth only once a day.
·Step：Remove the 300 types of bacteria in your mouth each morning with a battery－operated toothbrush. Brush gently for 2 minutes, at least twice a day.
2．How many times did you wash your hands or bathe yesterday?
·Finding：Seniors, on average, bathe fewer than 3 days a week. And nearly 30% wash their hands only 4 times a day—half of the number doctors recommend.
·Step：We touch our faces around 3，000 times a day—often inviting germs(病菌)to enter our mouth, nose, and eyes. Use toilet paper to avoid touching the door handle. And, most important, wash your hands often with hot running water and soap for 20 seconds.
3．How often do you think about fighting germs?
·Finding：Seniors are not fighting germs as well as they should.
·Step：Be aware of germs. Do you know it is not your toilet but your kitchen sponge(海绵)that can carry more germs than anything else? To kill these germs, keep your sponge in the microwave for 10 seconds.
小题1:What is found out about American seniors?
A．Most of them have good habits.
B．Nearly 30% of them bathe three days a week.
C．All of them are fighting germs better than expected.
D．About one third of them brush their teeth only once a day.
小题2:Doctors suggest that people should wash their hands ________．
A．twice a day B．three times a day
C．four times a dayD．eight times a day
小题3:Which of the following is true according to the text?
A．We should keep from touching our faces.
B．There are less than 300 types of bacteria in the mouth.
C．A kitchen sponge can carry more germs than a toilet.
D．We should wash our hands before touching a door handle.
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单项选择题

在下列应用层协议中，利用UDP实现无连接传输的是（），利用TCP实现面向连接传输的是（）。

利用TCP实现面向连接传输的是（）

A．TFTP

B．FTP

C．RPC

D．SNMP
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