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问题
单项选择题
既能温经止血，又能温中止痛的药物是（）
A.干姜
B.炮姜
C.生姜
D.灶心土
E.桂枝
答案
参考答案：
B
选择题
Only when the meeting began _____ that he had left his papers at his office.
A. will he realize
B. he did realize
C. did he realize
D. should he realize
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判断题
蛋白质的主要功能是为机体提供能量。()
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