1．测量仪器分类：

　 (1)悬挂类：　　　　　　　　 (2)支持类：

2．测量仪器的示数(称为视重)含义：

　对于悬挂类，示数为物体对悬挂物的拉力，由牛顿第三定律可知，该力等于物体所受的拉力．

　　　　　　 对于支持类，示数为物体对悬挂物的压力，由牛顿第三定律可知，该力等于物体所受的支持力．

　　　　　　 通过牛顿第三定律，可将对弹簧秤受力的研究转换为对物体受力的研究．无论物体状态如何，

　　　　　　 物体对支持物的压力(或对悬挂物的拉力)始终等于支持物(或悬挂物)对物体的作用力．

要求：1)可根据内容要点适当增加细节，使行文连贯。

2)词数：150字左右。短文开头已为你写好，不计入词数。

参考词汇：

1．拥堵-congestion

How to Solve the Problem of Heavy Traffic?

With the development of economy, more and more vehicles are going on the streets._______________________________________________________________________

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

35. -Ted found a policeman passing by and handed the mobile phone over to him.

-But he _________ at the place until the owner returned.

A. must have waited　　　　　　　　　 　B. might have waited　

C. would have waited　　　　　　　　　 D. could have waited

34. The books mainly deal with the trouble teens might have _________ right from wrong.

A. distinguishing　　 　B. distinguished　　 C. to distinguish　　 　D. to be distinguished