冷凝器按冷却方式可分为（）、（）及（）3种。家用电冰箱的冷凝器一般都是（）式的。
参考答案：水冷式；空气冷却式；蒸发式；空气冷却
We _____ each other since you left. [ ]
A. didn't see
B. hadn't
C. haven't seen
D. have seen
用所给词的形写填空。
1. A ( medicine) team was sent there yesterday.
2. No students are allowed in the classroom without (permit).
3. If Larry were ( come) , what would we say to her?
4. I wish I ( be) 20 years younger.
5. If you lived there for a while, you ( change)you mind about that place.
