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问题 多项选择题

关于钾的代谢，下列说法正确的是（）。

A.体内98％的钾分布在细胞内，2％在细胞外

B.血浆钾仅占总量，0.3％，浓度为3.5～5.5mmol/L

C.细胞膜上的钠泵，使细胞排钠保钾

D.肾有较好的排钠功能，但无有效的保钾能力

E.肾是排钾的主要器官

答案

参考答案：A, B, C, D, E

听力题

小题1:The       (大气层) of the earth can hold back some of the harmful rays of the sun.

小题2:The boy suddenly lost his b_______________ and fell from the tall tree.

小题3:She is fat. She has been taking exercise to lose w____________ from day to day.

小题4:You hurt his feeling. You should a_________________ to him for what you said.

小题5:The village is          (环绕) on all sides by hills.

小题6:You need to accept people who have different _____________ ( 信仰) from ours.

小题7:We should set a proper amount to be read in a  _______________ ( 有限的) time.

小题8:Qingdao        (海港) is one of the busiest ones in China..

小题9:We asked his ____________________( 允许 ) to use the car.

小题10:It is _________________ ( 显然的 ) that you are telling a lie.
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选择题

下列区域中，光照充足但热量不足，土地生产能力较低的是[ ]

A．河西走廊

B．江南丘陵

C．青藏高原

D．东北平原
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