摘要： 挂上
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电车的车门下通常挂一条铁链，在电车行驶的过程中，铁链是提起的而不与地面接触，当电车停车开门时，铁链下落与地面接触，这是因为( )
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| A．铁链与地面接触，可以增加地面与电车之间的摩擦，使电车尽快停下来 |
| B．铁链与地面碰撞发出响声，告知乘客电车已停稳 |
| C．铁链与地面接触，可以释放电车上由于摩擦积累的电荷，避免乘客上下时发生放电现象 |
| D．铁链与地面接触，可以摩擦起电，补充电车行驶时消耗的电能 |
补全对话，把相应的字母填写在横线上。
［Kate的风筝挂在了树上，Tom将它取了下来，谢天谢地！这风筝完好无损。］
Kate: Tom! Tom!
Tom: ______ 1
Kate: Look, My kite is in the tree. I … I can' t get it down.
Tom: ______2 let me help you ______ 3
Kate: Oh, thank you. ______ 4 Tom. thank you for your help.
Tom: ______ 5
A. Don't worry.
B. It's all right.
C. What's wrong?
D. Catch!
E. You're welcome.
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Kate: Tom! Tom!
Tom: ______ 1
Kate: Look, My kite is in the tree. I … I can' t get it down.
Tom: ______2 let me help you ______ 3
Kate: Oh, thank you. ______ 4 Tom. thank you for your help.
Tom: ______ 5
A. Don't worry.
B. It's all right.
C. What's wrong?
D. Catch!
E. You're welcome.