牙周病最重要的临床表现之一是()
A.牙齿移位
B.牙周溢脓
C.口臭
D.牙周袋形成
E.牙龈肿胀、出血、疼痛
参考答案:D
What is the way George thought of ______ enough money to buy the house?
A.to get
B.getting
C.having got
D.being got
下列化合物属于多糖的是()
A.淀粉
B.树脂
C.树胶
D.果胶
E.蔗糖