牙缺失的原因不包括
A．龋齿
B．牙周病
C．生理退行性病变
D．全身疾患
E．牙龈炎
参考答案：E
Little__that the basketball he once played could be sold for 150,000 Yuan at the auction(拍卖).
A．Yao Ming expected
B．Yao Ming had expected
C．did Yao Ming expect
D．had Yao Ming expected
《中国药典》规定，防己药材的原植物是（）。
A.广防己
B.木防己
C.粉防己
D.川防己
E.湘防己
