被称为"千湖之国"的国家是()
A.挪威
B.瑞典
C.荷兰
D.芬兰
参考答案:D
在两个物体相互摩擦起电的过程中,两物体电荷的总量( )
A.增多
B.减少
C.保持不变
D.是否变化不能确定
— Does your sister remember to return the library book today?
— Oh, yes. Thank you. She's ______ it for two weeks. [ ]
A. kept
B. had
C. borrowed
D. keeping