《献血法》应当掌握的要点是什么？
参考答案：国家提倡十八周岁至五十五周岁的健康公民自愿无偿献血；无偿献血的血液必须用于临床，不得买卖。
Hurry up! It's time _____ music class. [ ]
A. in
B. for
C. at
We don't have any _____ in the fridge. Let's go and buy some cola and orange juice. [ ]
A. vegetables
B. drinks
C. food
D. fruit
