Which of the following is the main idea of this passage? 查看材料

Directions :， For this part， you are allowed 30 minutes to write a composition on the topic "The Life on Internet".You should write at least 120 words， and base your composition on the outline given in Chinese below :

1．21世纪是网络的时代；

2．网络生活多姿多彩；

3．网络生活是我们生活的一部分。

如果让我来决定我们是要一个没有自行车的城市，还是要一个没有汽车的城市，我会毫不犹豫地选择后者。

我已了解清楚，她的结论是以事实为根据的。

为了不被发现，她不得不屏住呼吸。

我若是校长的话，我一定会给学生减负。

In his eagerness to make money from trees， he has cut them down in large numbers， only to find that without them he has lost the best friends he had. （Passage 2 ）

他连自己都养不活，更别说养家了。

The first paper money looked more like a note from one person to another than paper money used today. （ Passage 3 ）

In practice， this is an advantage to the aeroplane， which is already at a good height when it rea-ches the polar region and so does not to climb， while at the same time cold air keeps the clouds down low. （Passage 1 ）

The meanings of thousands of everyday perceptions， the bases for the decisions we make， and the roots of our habits and skills are to be found in our past experiences， which are brought into the present by memory. （Passage 2）