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问题 单项选择题

某工厂有在职职工10000人，欲了解职工对现行医疗保险的看法，随机抽取500人进行调查，可采用哪种方法获得样本

A．单纯随机抽样
B．系统抽样
C．整群抽样
D．分层抽样
E．多阶段抽样

答案

参考答案：A

写作题

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。

With the development of the Internet and the popularization of computers, shopping on the Internet has become a common place in our life. Here consumers can buy almost everything they need.

Shopping on the Internet has a lot of advantages, of which the most important is perhaps its convenience. People don’t have to waste a lot of their energy and precious time to go from one shop to another to choose the commodities they like. This is especially desirable to the old, the sick and the busy people who cannot go to the shops in person. The goods come in all shapes, sizes and colors on the Internet. The commodities they order will be delivered to them promptly.

However, shopping on the Internet also has its disadvantages. The first disadvantage is that the consumers can’t see the goods or try them on personally. Sometimes, the real goods may not be the same as what they have seen on the computer. The second disadvantage is that some shops on the Internet are not registered. They will never deliver anything to you after they get the money from you. Once cheated, you will find that you have nowhere to go to complain.

1. 以约30个词概括短文的要点;

2. 然后以约120个词以”网上购物”为主题发表看法,并包括以下要点:

(1) 你认为网上购物的最大优点是什么;

(2) 描述你或你的朋友或同学网上购物的体验;

(3) 你对网上购物有什么建议.

1. 可以使用事例或其他论述方法支持你的观点, 也可以参照阅读材料的内容但不能直接引用原文中的句子;

2. 标题自拟.
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单项选择题

对于有消声要求的通风和空气调节系统，其风管内的风速( )。

A．需要恒定
B．越大越好
C．没有任何要求
D．越小越好
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