对于获得性泪溢，询问病史应注意
A．有无泪囊炎B．局部用药史C．以上全是D．单侧或双侧泪溢史E．颜面中部外伤或鼻骨骨折史
参考答案：C
Before attending the NPC held in Beijing as a deputy ,he had made a lot of investigations about
this issue, _____ turned out to be a wise decision. [ ]
A. that
B. which
C. when
D. where
某些建筑材料中含有放射性元素 22286Rn（氡），会对人体产生一定危害．该原子的质子数是（ ）
A．50
B．86
C．136
D．222
