2022-2022年英语周报七年级外研第7期第五版答案

ll.BD【解析】本题考査法拉第电磁感应定律,目的是考查学生的分析综合能力。金属杆PQ在进入磁场过程中做匀速运动,有mgim=ILB由法拉第电磁感应定律和闭合电路欧姆定律有E=Ba,=b,解得儿童的速度σ-5m/s,选项A错误;设座椅释放时金属杄PQ距磁场上边界的距离为x,由机械能守恒定律有mersin 8-=2m2,解得x=2.5m,选项B正确:考虐座椅从刚进入磁场到刚离开磁场的过程中,做匀速运动,动能不变,由能量守恒定律有Q-mg×2s·sinθ-80J,选项C错误、D正确。

第四部分写作第一节短文改错As I was sitting in my dentist's waiting room at lastweekend, I happened A read an article in a magazine. Itwas about how our way of life would be in the year 2050The author warned that the robots might turn against us.What a frightening thought! Fifteen minutes lateHI sat inthe dentist's chair, with my eyes closed. But I find itimpossible to forgetrticle I had just read while thedentist was checking my teeth. All of a sudden, I had acrazily idea, "What if the dentist is replaced by a robot?crazyo I opened my eyes quickly.Seenthe dentist's friendlyface. I felt relaxingrelaxe

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