题目

英国科学家法拉第 A．发现了电流具有热效应 B．用实验证明了电流的周围存在着磁场 C．发现了电磁感应现象 D．发现了通电导体在磁场中要受到力的作用   答案：C 【解析】 英国物理学家法拉第历经10年的探索，发现了电磁感应现象，导致了发电机、电动机和变压器的相继问世，使电能的大规模生产、传输和利用成为现实，人类社会进入了电气化的时代．故C正确为答案．  根据下列句子及所给单词的首字母，在答题纸上按题号写出各单词的完全形式（每空限填一词）。 71．August is the h_______ month in Hangzhou, isn’t it? 72．Do you know the difference b_________ “beside” and “besides”? 73．We must be hurry. There is only ten minutes l__________. 74．Be careful while c________ the busy street. 75．He can’t see the blackboard clearly, so he needs a pair of g___________. 76．He is late again; however, his home is only five m________ walk from school. 77．We are familiar with the books w________ by Guo Jingming. 78．My best friend had a car accident last night, l_________, he was not hurt. 79．You must make a d________ at once, because we don’t have enough time. 80．Don’t you mind o_________ your help when some one is in trouble?