充电系不充电的原因可能有（）
A、传动带松
B、调节器故障
C、点火开关故障
D、蓄电池亏电
参考答案：A, B, C
— I am interested in that laptop. It seems to be the latest style.What do you charge for it?
— $8000.
— ________, but I can't afford it. [ ]
A. It's worth that
B. It's really nice
C. Please lower the price
D. That's too dear
大型中餐宴会有提前摆放冷菜的要求，提前摆放冷菜的合适时间为（）。
A.开餐前其他分钟
B.开餐前15分钟
C.开餐前20分钟
D.开餐前30分钟
