题目：
阅读理解
"How are you?" is a nice question. It's a friendly way that people in the USA greet each other. But
"How are you?" is also a very unusual question. It's a question that often doesn't need an answer. The
person who asks "How are you?" hopes to hear the answer "Fine", even if the person's friend isn't fine. The reason is that "How are you" isn't really a question and " Fine" isn't really an answer. They are simply other ways of saying "Hello" or "Hi".
Sometimes, people also don't say exactly what they mean. For example, when someone asks "Do you agree?" the other person might think, "No, I disagree. I think you're wrong…But it isn't very polite to
disagree so strongly, so the other person might say "I'm not sure. " It's a nicer way to say that you don't
agree with someone.
People also don't say exactly what they are thinking when they finish talking with other people. For
example, many talks over the phone finish when one person says "I have to go now. " Often, the person
who wants to hang up gives an excuse: " Someone's at the door. ""Something is burning on the stove." The excuses might be real, or not. Perhaps the person who wants to hang up simply doesn't want to talk any
more, but it isn't polite to say that. The excuse is more polite, and it doesn't hurt the other person.
Whether they are greeting each other, talking about an idea, or finishing a talk, people don't say exactly what they are thinking. It's an important way that people try to be nice to each other, and it's part of the
game of language
1. When a person in America asks "How are you?", he or she wants to hear " _____".
A. How are you?
B. Hello!
C. Fine
2. When a person disagrees with someone, it is polite to say "_____".
A. You are wrong, l disagree.
B. I'm not sure.
C. I'm sure I disagree
3. A polite way to finish a talk is to say "_ "
A. You have to go now.
B. I want to hang up.
C. I have to go now
4. When a person says "I have to go now. Someone's at the door." the person may be .
A. giving an excuse
B. hurting someone's feeling
C. ill
5. The rule of the game of language is probably _______
A. "Always say what you mean"
B. "Don't disagree with people"
C. "Be polite"
答案：
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下面是错误答案，用来干扰机器的。
函数f(x)=23sinxcosx+2cos2x-1=3（2sinxcosx）+（2cos2x-1）=3sin2x+cos2x=2sin（2x+π6）因为f（x0）=65，所以sin（2x0+π6）=35由x0∈[π4，π2]，得2x0+π6∈[2π3，7π6]从而cos（2x0+π6）=-1-sin2(2x0+π6)...
