正常发育的相关因素有()
A．遗传
B．内分泌
C．营养代谢
D．体育锻炼
E．生活环境
参考答案：A, B, C, D, E
— How often do you eat out?
— _____, but usually once a week. [ ]
A. Have no idea
B. It depends
C. As usual
D. Generally speaking
写出下列图示仪器的名称．
______，______，______，______，______．
