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问题 选择题

下图是a、b、c三种物质的溶解度曲线。把t1℃时三种物质的饱和溶液温度升高到t2℃。则三种溶液的溶质质量分数大小关系是

[ ]

A．a>b>c

B．b>a>c

C．b>a=c

D．c>b>a

答案

答案：B

听力题

1. As teenagers grow, it is normal for them to become ________ (困惑的)with the changing world both inside and outside of them.

2 To remember so many words in such a short time is really ________ (挑战性) for an ordinary students.

3. She has been c________ with his friends online all the morning. No wonder she hasn’t finished the task yet.

4. If you eat the right food and exercise r________, you can feel better, look better and have more energy.

5. After a heated a___________, a decision was finally made.
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不定项选择题

下列关于水的离子积常数的叙述中，正确的是 [ ]

A．因为水的离子积常数的表达式是KW＝c（H+）·c（OH-），所以KW随溶液H+和OH-浓度的变化而变化

B．水的离子积常数KW与水的电离平衡常数K电离是同一个物理量

C．水的离子积常数仅仅是温度的函数，随着温度的变化而变化

D．水的离子积常数KW与水的电离平衡常数K电离是两个没有任何关系的物理量

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