影响身体发育的因素有（）
A.营养代谢
B.生活条件
C.内分泌
D.体育锻炼
E.种族遗传
参考答案：A, B, C, D, E
This is the very letter ______ came last night. [ ]
A. who
B. which
C. that
D. as
为什么说一切物体都有能量？
