马钱子的成人一日常用量是()
A.0.1~0.3g
B.0.3~0.6g
C.0.01~0.03g
D.0.03~0.06g
E.0.06~0.09g
参考答案:B
People ________ need less sleep as they get older. [ ]
A. tend to
B. intend to
C. prefer to
D. accustom to
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