对于反应：A+B＝C下列条件的改变一定能使化学反应速率加快的是[ ]

A．增加A的物质的量

B．升高体系的温度

C．增加体系的压强

D．减少C的物质的量浓度

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.