职场性骚扰的类型（）。
A.性的交换（交换条件式性骚扰）
B.敌意的工作环境
C.性的徇私
D.非雇主或非受雇员工的性骚扰
参考答案：A, B, C, D
Bob tried to sweet-talk his mother into letting him go out. But when he saw his sweet talk________， he lost his temper.
A．hadn’t worked
B．wasn’t working
C．isn’t working
D．doesn’t work
简述水合物的产生条件及对生产的危害。
