夜啼的好发年龄为（）
A.1岁以内
B.1～3岁
C.3～6岁
D.1～6岁
E.6～12岁
参考答案：A
解析：夜啼的好发年龄在1岁以内。
补全对话。
A: Excuse me. Is 1_____ a fruit market 2_____ the neighborhood?
B: 3_____. I don't know. You'd better ask that man over there.
A: Thank you 4_____ 5_____ 6_____
B: Excuse me. Can you tell me the way 7_____ the fruit market?
C: Well, yes. Just go straight and 8_____ the second turning on the right.
Go 9_____ Center Street on the left, it's in 10_____ of a park.
更换晶体管调节器时，要注意调节器的（）应相符。
A．最大功率；
B．最大工作电流；
C．标准电压；
D．反向电阻
