题目

阅读短文，选择正确答案。I'm Amy. I'm from America. Jim is my good friend. He's from England. Jim's father is a policeman. Jim's mother is a nurse. She's beautiful. This is Jim's aunt. She's a TV reporter. That girl is Jim's sister. She's seven. She's my friend, too.【1】Amy, Jim and Jim's sister are ________. ( )A.good friends B.a happy family C.from America【2】Jim's father is a ________. ( )A.policeman B.nurse C.TV reporter【3】Jim's mother is ________. ( )A.nurse B.beautiful C.teacher【4】Jim's aunt is ________. ( )A.a nurse B.seven years old C.a TV reporter【5】Jim's 如图所示，绝缘水平面上锁定着两个质量均为m，电荷量分别为+9q、+q，体积很小的物体A和B，它们间的距离为r，与平面间的动摩擦因数均为μ．已知静电力常量为k．如果解锁它们开始运动，则当它们动能最大时，它们相距的距离为A.3qB.C.2rD.3r