下列物体中，在通常情况下，属于绝缘体的物体是： [ ]
A.CuSO4水溶液
B.液态水银
C.蒸馏水
D.熔丝
答案：C
甲种商品每件m元，乙种商品的单价是甲种商品的单价的2倍，甲、乙两种商品各买2件，共需付（ ）元．
Was it in this very room ____ he made up his mind ____ he should break away from his family?
A．that; which
B．which; that
C．which; which
D．that; that
