[音频]1. What was once used as money in American prisons?
A. Soup
B. Noodles
Cigarettes.
D. Fruits.
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2.What do the prisoners use ramen （日式拉面） to do?
A. Smuggle cigarettes in the black market.
B. Hire services from other prisoners.
C. Exchange it for money.
D. Bribe(行贿） the cook.
3. Why is ramen replacing traditional cigarettes as money in American prisons?
A. It is cheap and easier to get.
B. It is valuable and difficult to get.
C. It is healthier than cigarettes.
D. It is more delicious than other food.
篮球质量0.6Kg，从最高处下落，到达地面速率6米/秒，原速率反弹，动量的增量的大小为（）
A. 7.2
B. 3.6
C. 0.6
D. 1.2
篮球质量0.6Kg，从最高处下落，到达地面速率6米/秒，原速率反弹，若与地面作用时间为0.01秒，则与地面相互作用力大小为 （ ）（SI）
A. 120
B. 360
C. 720
D. 800
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