题目

用丝绸摩擦过的玻璃棒和用毛皮摩擦过的硬橡胶棒，都能吸引轻小物体，这是因为（） A . 被摩擦过的玻璃棒和硬橡胶棒一定带上了电荷 B . 被摩擦过的玻璃棒和硬橡胶棒一定带有同种电荷 C . 被吸引的轻小物体一定是带电体 D . 被吸引的轻小物体一定带正电 答案：ANeither Kate nor her cousin _____ to Russia, but _____ of them have known the country very well.A. have been； neither B. have gone； eitherC. has been； both D. has gone； both