一次性防护手套主要（）使用。
A.操作食品
B.肉类分割
C.搬卸商品
D.接触化学试剂
参考答案：D
妊娠期口腔检查和治疗不应进行（）。
A．龋齿检查
B．牙周检查
C．牙颌X线片
D．牙周洁治
E．龋齿充填
Of course, there have been times, as a young man, when I got tired from study and devoted my time to playing.()
A. tired of
B. got tired of
C. tired up
D. used to tire of
