电焊、氩弧焊等作业过程中会产生紫外线置业危害。紫外线照射人体引起的职业病是（）
A.职业性白内障
B.滑囊炎
C.电光性眼炎
D.铬鼻病
参考答案：C
Children should learn to _____, but they are too selfish (自私) and don't want to play their own toys with
others. [ ]
A. support
B. care
C. spare
D. share
亚甲蓝等碱性染料在电离状态下常有正电荷，易与碱性染料结合的细菌等电点是（）
A.pH4～6
B.pH6～7
C.pH7～9
D.pH2～5
E.pH8～9
