Professor Wang，__________ for his informative lectures，was warmly received by his students．
A. Knowing
B. Known
C. to be known
D. having known
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——The thread of kite broke and it flew away．——I told you it would easily break __________it was the weakest．
A. when
B. for
C. since
D. where
顺式作用因子（cis-action factor）
以下哪项不是虚证的临床表现()
A. 五心烦热
B. 舌嫩少苔
C. 腹胀满不减
D. 声低息微
E. 怕冷喜加衣
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