患有深度近视的人员不得从事下列（）工作。
A.电气维修
B.浮选司机
C.选煤司机
D.清仓作业
参考答案：D
抑制锌吸收的因素是（）
A.膳食纤维
B.植酸
C.铜
D.钙
E.亚铁离子
The teacher, with 6 girls and 8 boys of her class, _____ visiting a museum when the earthquake struck.[ ]
A. was
B. were
C. had been
D. would be
