游离龈沟位于（）
A.游离龈与牙体之间
B.附着龈与牙体之间
C.游离龈与附着龈之间
D.牙龈与牙槽骨之间
E.结合上皮与牙体之间
参考答案：C
用所给动词的适当形式填空。
1. John is the _____(win) of the photo competition this year.
2. _____ you_____ (have) any eggs for breakfast yesterday?
3. The old man _____ (leave) here half an hour ago.
4. —Where _____you _____ (meet) the famous actor?
—I met him in Beijing.
5. I _____ (not hear) the alarm yesterday, so I_____ (get) up late.
阿托品用作犬麻醉前给药的剂量是（）。
A、0.01mg/kg
B、0.04mg/kg
C、0.08mg/kg
D、0.lmg/kg
E、0.15mg/kg
