最易诱导耐受的时期是（）。
A．胚胎期
B．新生儿期
C．儿童期
D．青年期
E．老年期
参考答案：A
用所给词的正确形式填空。
1. Autumn is coming. The leaves ______ (begin) ______ ( turn) red.
2. Last week, Mum ______ (fall) ill. I ______ (have) to stay at home and ______ (look) after her.
3. How long did you spend ______ (finish write) the letter？
4. After a long walk, I want to stop______ (have) a rest.
5. She was an ______ (usual) girl.
运行中变压器呼吸器堵塞时，瓦斯保护不能临时切信号。（）
