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【单选题】
Read the following paragraph from the introduction [paragraphs 1-5] of the article. Hide-and-seek is hard. It is harder than something like playful wrestling. You have to know the rules to play hide-and-seek. You also need to understand different roles. What is the focus of this paragraph?A.
why hide-and-seek is hard
B.
why playful wrestling is hard
C.
what the rules of hide-and-seek are
D.
what the roles of hide-and-seek are
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文： Good morning, everyone. And welcome to the English for Academic Purposes Center. I'd like to begin by briefly introducing the services we offer here at our center. First of all, we have a wide r...
A.
Conversation class.
B.
Writing skills class.
C.
Examination skills class.
D.
All of the three courses.
【单选题】一个平行板电容器,充电后与电源断开,当用绝缘手柄将电容器两极板间距离拉大,则两极板间的电势差 U 12 、电场强度的大小 E 将发生如下变化:
A.
U 12 减小， E 减小
B.
U 12 增大， E 增大
C.
U 12 增大， E 不变
D.
U 12 减小， E 不变
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