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空气、人类赖以生存的自然资源． （1）空气中含有多种成分，它属于______（填物质类别），人类时刻都离不开空气，是因为空气中的氧气能______． （2）水分子是由______ 和______ 构成的．天然水中含有许多杂质，实验室常用过滤的方法除去水中悬浮的杂质，过滤需要用到的仪器有：带铁圈的铁架台、漏斗、玻璃棒和______． （3）为了防止水的污染，下列各项措施中可行的是______． A．抑制水中所有动植物的生长 B．任意排放工业废水； C．生活污水经处理达标后再排放 D．禁止使用农药和化肥．
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【简答题】晶体在不同晶向上的性能是 , 这就是单晶体的 现象。 一般结构用金属为 晶体,在各个方向上性能 ,这就是实际金属的 现象。 �
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【单选题】— Are you pleased with his work? — Of course. It couldn't be _____. [ ]
A.
any worse
B.
any better
C.
the best
D.
so bad
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A.
he doesn't know anyone on his course.
B.
he doesn't know the overseas students on his course.
C.
there are no people from his country on his course.
D.
there are few overseas students on his course.
【简答题】A．He couldn't make any sense out of his course. B．He hasn't taken more than one philosophy course. C．He is a philosophy major. D．He hasn't taken any philosophy course in that department.
【单选题】David said that it was because of his strong interest in literature ________ he chose the course.
A.
that
B.
what
C.
why
D.
how
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