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问题
单项选择题
主治风寒外束，痰热内蕴之哮喘的方剂是( )
A．止嗽散
B．定喘汤
C．麻杏不甘汤
D．小青龙汤
E．苏子降气汤
答案
参考答案：
B
选择题
With more forests destroyed, huge quantities of good earth _____ for the past few decades.
A. is washing away
B. has been washed away
C. are washed away
D. have been washed away
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判断题
负强化等同于惩罚。
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