题目

如图所示，弹簧秤下挂一条形磁铁，其中条形磁铁N极的一部分位于未通电的螺线管内，下列说法正确的是 A、若将a接电源正极，b接负极，弹簧秤示数减小 B、若将a接电源正极，b接负极，弹簧秤示数增大 C、若将b接电源正极，a接负极，弹簧秤示数增大 D、若将b接电源正极，a接负极，弹簧秤示数减小 答案：AC 解析: 略Read and write.按要求完成句子。1. wants, for, to, some, gifts, his, Li Ming, buy, family_____________________. (连词成句)2. _________________? (根据答句写问句) I wash my face twice a day.3. This is a boy. → These are many boys. (模仿范例写句子)That is a baby. → _________________.4. How many classes do you have each school day? (根据实际情况回答问题)______________________.5. What did you do yesterday? (看图回答问题) _____________________.