问题
选择题
Tom is in Class 1 and I am in Class 2. _____ are not in the same class. [ ]
A. They
B. You
C. We
D. He
答案
答案：C
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Tom is in Class 1 and I am in Class 2. _____ are not in the same class. [ ]
A. They
B. You
C. We
D. He
答案：C
Do you have lots of friends? What do you 36 friends and friendship? Are they very important for you? Some of your friends may have different views and interests, and some like doing the same 37 as you. Do you like friends different from 38 the same as you? You may like the friends who 39 the same interests as you. But I don’t really care. I have two good friends, Peter and James. Peter is 40 me. I am a quiet boy, and Peter is also quiet. We 41 enjoy reading books and surfing the Internet. On weekends, we often go to the library or 42 on the computer together. But James is very different from us. He likes playing ball games, and he is more athletic than us. He is 43 more outgoing. He likes talking and often makes 44 laugh. You see, friends are not 45 to be the same. Do you agree with me?
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Ax1＞0，f(x2)=
Ax2＜0，证明：存在n维向量x0≠0，使
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