职业卫生与职业医学的基本任务主要是（）

A.提高职业卫生科学水平

B.积极防治职业病

C.识别、评价、预测和控制不良劳动条件

D.检测、评价和消除不良劳动条件

E.提高劳动生产率

—_______ we eat in the classroom?

—No, _______. [ ]

A. Can, we can't

B. Can, you can't

C. Do, you didn't

D. Do, they can't