如图所示，框架面积为S，框架平面与磁感应强度为B的匀强磁场方向垂直，则穿过平面的磁通量为____．若使框架绕OO′转过60°角，则穿过框架平面的磁通量为____．

自1840年鸦片战争爆发以来，列强凭借坚船利炮，强迫清政府签订了《南京条约》、《马关条约》、《辛丑条约》等不平等条约。以上三个条约对中国影响的共同点是 （   ）       

在甲、乙两幅图幅大小相同的地图上，某两地间的图上距离分别为8厘米和4厘米，这说明（　　）。

任务型阅读

     My name is Chen Yang. I'm twelve years old. I'm a Chinese student.

     There are four people in my family—my father, my moth er, my brother and I. My father is a doctor at the City Central Hospital and my mother is a theatre manager. My brother is a student, too. He is thirteen. We are in the same school, but not in the same class.

I like English very much. I can speak a lot of English. I want to have an American pen friend. Let's be friends, OK? Please write to me. My address is No. 22 Middle Sc hool, Hunan, China. My email is Cheny @ hotmail. com.

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