车辆在转弯时，（）能使两主动车轮转速不同，防止外轮所走路程长而产生轮胎的拖滑现象。
A、变速器
B、减速器
C、差速器
参考答案：C
下列（）项所列水体污染防治不适用《水污染防治法》？
A.湖泊水体
B.江河水体
C.地下水体
D.领海水体
_____ we were worried about was _____ they could manage to control the pollution. [ ]
A. That; how
B. What; whether
C. That; whether
D. What, that.
