阅读理解。

1. How many kinds of drinks are there on the menu?

A. Two.

B. Four.

C. Eight.

D. Ten.

2. If you have only three dollars, what food can you buy?

A. A chocolate.

B. An egg sandwich.

C. A cup of tea.

D. A hot dog.

3. Jeff wants to order a hamburger, a large orange juice and two apple pies. How much will he have to pay?

A. $ 13.95.

B. $ 13.75.

C. $ 13.65.

D. $ 9.80.

4. Which food is not mentioned (提及) on the menu?

A. Vegetables.

B. Chocolate.

C. Fresh fruit.

D. Ice-cream.

5. The food on the menu is a kind of _____ food.

A. Chinese

B. Japanese

C. Indian

D. American

如图所示，一轻弹簧原长为L，一端固定于O点，另一端系一重物，将重物从与悬点O在同一高度且弹簧保持原长的A点无初速地释放，让它自由摆下，不计空气阻力，在重物由A点摆向最低点的过程中，下列说法正确的是（     ）

A．重物的重力势能减少，弹簧的弹性势能增加

B．重物重力势能的减少量等于弹簧弹性势能的增加量

C．重物重力做功mgL，重力势能就减少mgL

D．重物摆到最低点时，重力的瞬时功率最大