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问题 不定项选择

当两个分子之间距离为r0时，正好处于平衡状态，下面关于分子间相互作用的引力和斥力的各种说法中，正确的是 [ ]

A．两分子间的距离r＜r0时，它们之间只有斥力作用

B．两分子间的距离r＜r0时，它们之间只有引力作用

C．两分子间的距离r＜r0时，它们之间既有引力又有斥力的作用，而且斥力大于引力

D．两分子间的距离等于2r0时，它们之间既有引力又有斥力的作用，而且引力大于斥力

答案

CD

补全对话，情景问答

选择适当的选项补全对话。

A: Hello, John.

B: Hi, Mary. Nice to meet you.

A: Nice to meet you,too.    1    

B: Yes, you are right.

A:    2   

B: We can't amve late for class. We can't eat in class and  we can't fight.

A: Can you listen to music after class?

B: Yes, we can.

A:  3  

B: No, we can't.

A:    4   

B: Yes, we do. We have to wear them every day at school.

A:    5   

B: We have to clean the classroom.

A. Do you have to wear uniforms at school?

B. What else do you have to do?

C. What are the rules at your school?

D. Can you run in the hallways?

E. I hear you're studying in Yu Ying Middle School.
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单项选择题

运用扶正祛邪应遵循的总原则是（）

A.单独使用

B.先后使用

C.扶正不留邪，祛邪而不伤正

D.同时并用

E.以扶正为主，兼以祛邪
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