婴幼儿时期基础代谢的能量消耗应占总能量消耗的（）。
A．30%
B．40%
C．50%
D．60%
参考答案：D
解析：
婴幼儿时期基础代谢
—It's time to go to bed, Li Ping.
—Mum, I have a lot of homework to do, I won't go to bed ________ I finish it. [ ]
A. until
B. since
C. as soon as
D. after
高处作业区各作业位置至相应坠落高度基准面的垂直距离中间的最（）值。
A、大
B、小
C、初
