_

3. reduce vt. 减少, 降低, 缩减, 降价

reduce. . . to. . . 把......降到/减少到......

reduce. . . by. . . 把......降低/减少了......

例句：1). She reduced her weight from 48 to 42 kilos by taking exercise and dieting.

她通过锻炼和节食把体重从48千克减少到42千克。

2). The number of the students in our school was reduced by 20% this year.

今年我们学校学生的数量减少了20%。

练习：用适当的介词填空。

1). The current death rate is reduced 10% compared with that of the year of 1980.

2). Many students have dropped out of school and now the number of our class has been reduced____

50.

4. belong to属于; 是......的一员

例句：He belongs to the school basketball club. 他是学校篮球俱乐部的成员。

【名师点津】个性的belong to

1). belong to后面不加名词性物主代词;

2). belong to不用于被动结构, 也不用于进行时态;

3).belong to短语中to为介词, 后跟名词或代词, 但后接副词时介词to要省略;

4).在特殊疑问句中, belong to有时可拆开, to位于句首。

例句： 1). Put the chair back where it belongs. 把椅子放回原处。

2). To whom does this belong? 这是谁的?

　练习：完成句子。

1). I picked up a book Tom. 我捡到一本属于汤姆的书。

2). Many scientists, the research group, were sent to attend the conference.

　 许多属于这个研究组织的科学家被派往出席这个会议。

5. Using cocaine increases the user's heart rate and blood pressure.

　使用可卡因会让使用者的心率加快并使其血压升高。

　using cocaine为v-ing短语在此句中作主语, 其用法如下:

　1) . v-ing短语表示经常性或习惯性的动作或行为, 其逻辑主语通常是形容词性物主代词或名词

所有格。

　2). 作主语时, 谓语常用单数。

　3). It is no use/no good/a waste of time doing sth. 做......没用处/没好处

　例句：Playing basketball is my favorite. 打篮球是我的最爱。

　 Tom's being late made the teacher angry. 汤姆的迟到令老师生气了。

　 It's no use crying over spilt milk. (谚语)牛奶洒了哭也无用。/覆水难收。

　练习：

1). _______________________________about 16 hours. 乘火车到杭州大约要16