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.

3. They form a polar molecule, that is, one with a slightly

　　 positive end and a slightly negative end.

2. Water is actually quite simple, but the way the water

　　 molecule is formed gives water its unique properties.

1. Life in the oceans range from the tiniest plants all the

　　 way up to giants like sharks and whales.

4．考试结束，监考人员将本试卷和答题卷一并收回。

预祝你取得优异成绩！