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    The bell rings (响). Mr. Wang goes into Class Three and wants to give an English lesson. At this time Mr. Zhang comes and asks him to attend (参加) an important (重要的) meeting. So Mr. Wang says to his students, "Study by yourselves, please."

     When Mr. Wang comes back,he sees Zhao Yang talking with his desk mate Li Cheng.

   “Stand up, Zhao Yang," says Mr. Wang, "What are you doing?"

    "I'm reading English," says ZhaoYang.

    "What's in your hand?" says Mr.Wang.

     ZhaoYang looks at his hand. It's a history book.Then he looks at Li Cheng. There is an English book in his hand. So he says, “Sorry, Mr. Wang. We are studying the history of England."

矩形线圈在匀强磁场中匀速转动，从中性面开始转动180°角过程中，平均感应电动势和最大感应电动势之比（ ）

①是否关注现实是马克思主义哲学与其他哲学的本质区别　

②马克思主义哲学不崇拜任何东西，按其本质来说是批判的、革命的　

③为无产阶级提供认识和改造世界的工具是马克思主义哲学的使命　

④只有马克思主义哲学才实现了实践基础上的科学性和革命性的统一