新生儿肺透明膜病的原因是（）
A.羊水吸入
B.胎粪吸入
C.窒息
D.出生前感染
E.肺泡表面活性物质生成不足
参考答案：E
Hardly Mike picked up the ball when another player took it form him.
A．have
B．has
C．had
D．have been
词型转换。
1. helpful (名词)_________ 2. noise (形容词)
3. both (反义词)_________ 4. real (副词)_________
5. use (形容词)_________ 6. thought (动词原型)
7. teeth (单数)_________ 8. die (名词)_________
9. gold (形容词)_________ 10. health (形容词)
