老年人蛋白质提供的热量占总热量（）。
A.10%～12％
B.12％～14%
C.14%～15%
D.15%～16％
E.17%～18%
参考答案：B
钟面上9时整，时针和分针所夹的角是______度，这样的角是______角．
If you want to learn English well, you must use it as ________ as possible. [ ]
A. often
B. long
C. many
D. soon
