阅读短文回答问题
Jim , Kate and Wang Hong are students in Class 3 , Grade 1 of No. 11 Middle School in Beijing . Jim is from the UK. Kate is from the USA. Wang Hong is a Chinese girl. The three students are good friends. They often do homework together and play together.
Now, Jim ,Kate and Wang Hong are doing their homework. Jim’s spelling of “Monday” is wrong（错的）. Kate tells him about it. Wang Hong doesn’t have an eraser in her pencil case. She wants to borrow(借) one from Jim or Kate. Jim says he has one and gives(给) it to Wang Hong. Wang Hong thanks Jim for help. Jim says, ”You’re welcome .” Now Jim says, “Thanks a lot,” to Kate for her help. “ Not at all,” says Kate.
小题1:Where do they study?
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小题2:Is Wang Hong a Chinese girl?
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小题3:Does Wang Hong have an eraser?
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小题4:Who has an eraser ?
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小题5:What do they often do together ?
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，B是3阶非零矩阵满足AB=0，则