将同一植物细胞依次浸入清水、0.3mol/L的蔗糖溶液和0.4mol/L的KNO3溶

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问题单项选择题

将同一植物细胞依次浸入清水、0.3mol/L的蔗糖溶液和0.4mol/L的KNO3溶液中，测得细胞的体积随时间的变化曲线如图所示，则曲线a、b、c分别代表细胞所处的溶液是（）

A.清水、蔗糖溶液、KNO3溶液

B.KNO3溶液、清水、蔗糖溶液

C.清水、KNO3溶液、蔗糖溶液

D.蔗糖溶液、KNO3溶液、清水

答案

参考答案：C

填空题

用before long和long before填空

1. It is said that_____________the spaceship of Shenzhou Ⅷ will be sent up.

2. The teacher told us that____________ we would have a sports meeting.

3.___________people had to use something called huoyou to light.

4. The old temple existed____________.

操作题

如图，物体M沿斜面匀速下滑，请画出它的受力示意图．