5. oxygen n. 氧气

4. hydrogen n. 氢

3. range vi.& n. 变动

2. transport n. & vt. 运输

1. sailor n. 水手

8.　 From the late eighteenth century to well into the

　　 nineteenth century different people struggled for their

　　 rights.

　　 ☆重点词汇☆

7. Freedom fighters can be found everywhere and they are

　 of all times.

6. Water, which seems ,so simple and common, is what

　　 makes life possible.

5. Heat capacity is the amount of energy it takes to raise

　　 the　 temperature　 of a substance　 by　 one　 degree

　　 centigrade.

4. The salinity of the earth's oceans is about thirty-five

　　 parts per thousand, meaning that there are about 35

　　 grammes of dissolved solids and gases in one kilo of

　　 water.