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问题 单项选择题

高举中国特色社会主义伟大旗帜，最根本的就是要坚持中国特色社会主义道路，坚持（）理论体系。

A.邓 * *

B.中国特色社会主义

C.三个代表

D.毛 * *

答案

参考答案：B

改错题

With the popularity of the Internet, more and more people prefer to going shopping online because its advantages. Online shopping can cost us a lot of valuable time. What’s more , there are a wide variety of goods for us to choose from , which may be cheaper than that in shops. Though it is convenience to go shopping online, the problems it caused can’t be ignored. Since we can’t see the actual goods on the Internet, the quality cannot be ensured. Beside, lots of advertisement on the Internet are untrustworthy, so sometimes the customers are easily cheated.

In my opinion, we should be carefully while we are enjoyed the convenience of online shopping.
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选择题

2013年1月我国大部分地区被雾霾笼罩，空气质量严重污染。PM 2.5

是指大气中直径小于或等于2.5微米(2.5×10－6m)的细小颗粒物，也称为可入肺颗粒物。下列有关说法中错误的是(　　)。

A．雾霾空气属于混合物

B．微粒直径为2.5微米的细小颗粒物可形成胶体

C．实施绿化工程，可以有效防治PM 2.5污染

D．PM 2.5表面积大，能吸附大量的有毒有害物质
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