人体每天所需要的能量大约有多少来自蛋白质（）
A.10%～20%
B.8%～15%
C.5%～10%
D.10%～15%
E.15%～20%
参考答案：D
恒牙骨化开始于（）
A.4岁
B.3岁
C.2岁
D.1岁
E.新生儿
Can you tell us ______ on April Fool's Day? [ ]
A. what she happened
B. what did she happen
C. what happened to her
D. what had happen to her
