搜题请搜索小程序“爱下问搜题”
问题 选择题
在下表中，设x表示乘公共汽车的站数，y表示应付的票价（元）
x（站）12345678910
y（元）1112233344
根据此表，下列说法正确的是（　　）
A．y是x的函数B．y不是x的函数
C．x是y的函数D．以上说法都不对
答案

根据题意：对于x的每一个取值，y都有唯一确定的值，

故y是x的函数．

故选A．

问答题

The first walk into outer space was taken by a Soviet astronaut. Astronaut Zhai Zhigang became the first Chinese to walk in space on September 27, 2008. It showed that it was quite safe for a man to be outside the spaceship for a certain period of time. But to walk in space, astronauts have to meet with many kinds of difficulties and dangers.

The spaceship goes round the earth at an altitude of about 200 kilometers above its surface. At such altitudes there is no atmosphere which protects the life on the earth. The conditions of outer space are very harmful to man.

The boiling point of liquids goes down with pressure. But pressure outside the spaceship is nearly zero. In such conditions the decompression of the spacesuit may cause the boiling of the blood and quick death. There is radiation from space and it is harmful.

Breathing problems in space can be solved with the help of the spacesuit. Another problem is heat. Man gives off heat in the course of his activity, and the harder the labor is, the greater the amount of heat is. In space unless special measures are taken, the heat inside the spacesuit would make the conditions difficult.

根据短文内容，完成下面的句子。(每空一词)
Zhai Zhigang became the first Chinese astronaut （）（）in space on September 27, 2008.
查看答案
单项选择题

下列恐怖袭击事件造成人员死亡数量最多的是（）。

A.东京地铁沙林毒气事件

B.美国“9.11”恐怖事件

C.莫斯科”10.23“人质劫持事件

D.泛美公司103客机爆炸案
查看答案