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.
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