⊕考纲要求：
◆ 考纲规定的考试范围:
重点单词与短语sailor；benefit；disadvantage；entertainment；medium；relatively；solid；available；pure；dense；relationship；mass；volume；float；absorb；release；stable；sensitive；bottom
句型
Life in the oceans range from the tiniest plants all the way up to giants like sharks and whales. range的用法。
Water is actually quite simple, but the way the water molecule is formed gives water its unique properties. the way 后的定语从句用法
They form a polar molecule, that is, one with a slightly positive end and a slightly negative end. that is 插入语的用法
语法：复习情态动词
