将洋葱表皮放入一定浓度的硝酸钾溶液中，其细胞便发生质壁分离，不久这些细胞又逐渐发生质壁分离复原、其原因是

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将洋葱表皮放入一定浓度的硝酸钾溶液中，其细胞便发生质壁分离，不久这些细胞又逐渐发生质壁分离复原、其原因是（）

A：质壁分离后的细胞只允许水分进入

B：细胞液的溶质透出细胞

C：K⁺和NO₃^﹣离子进入了液泡

D：水分和溶质自由地进出细胞

上一题下一题 0.0难度选择题更新时间:2018-03-20 03:52:51

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C

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选择下列词汇完成下面的对话，并在答题卡上将相应的字母编号涂黑。（共5小题，每小题1分）

A. named B. relax C. enjoyable D. worst E. start F. best

Lisa: Lily, it's Saturday today. Why not go and ____ ourselves this evening?
Lily: Good idea! What would you like to do? See a movie or watch a play?
Lisa: A movie. It's said a new movie ____ The Grey is on these days. Have you seen it?
Lily: No. But I heard it was the____ movie of the year.
Lisa: Really? Then how about the film Shadows of Love? It's a love story. It should be ____ .
Lily: OK. What time does it ____ , do you know?
Lisa: Wait a minute. I'll check it... Yes. It says 7:30 this evening.
Lily: Good. See you then.

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