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问题 选择题

下列关于氧气的物理性质的叙述错误的是（　　）

A．通常情况下，氧气是无色、无味的气体

B．相同条件下，氧气的密度比空气略大

C．鱼能在水中生活，说明氧气易溶解于水

D．液态氧是淡蓝色液体

答案

A、通常情况下，氧气是无色、无味的气体，叙述正确；

B、相同条件下，氧气的密度比空气略大，叙述正确；

C、鱼能在水中生活，是因为水中溶解有少量的氧气，氧气是不易溶于水的气体，不是易溶于水的气体，叙述错误；

D、液态氧是淡蓝色的液体，叙述正确；

故选C．

多项选择题

毕生发展观认为影响心理发展的因素是( )。

A．成熟

B．社会历史文化

C．规范事件

D．非规范事件
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单项选择题

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

11（）

A.back

B.on

C.off

D.by
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