肺癌高危人群的吸烟指数（每天吸烟支数×吸烟年数）应大于（）。
A.400
B.100
C.300
D.200
E.500
参考答案：A
--- Would you mind not littering in the classroom?
--- ______. I’ll pick up the waste paper.
A．With pleasure
B．Thanks
C．No, not at all
D．Yes, that’s all right.
坚持按顺序及时拉架时，移架滞后煤机不超过（）架。
A、5～8
B、1～3
C、2～4
D、3～5
