题目：
| 完形填空。 | |||
| Happiness is for everyone. In fact, happiness is always around you if you care about it. When you are in 1 at school, your classmates will help you; when you study hard at your 2 , your parents are always taking good 3 of you; when you get success (成功), your friends will say congratulations 4 you; when you do something 5 , people around you will help you correct it; and when you do something good to 6 , you will feel happy, too. All these things are 7 . If you pay attention to them, you can see happiness is always 8 you. Happiness is not the same as money. When you are poor, you can say you are very happy, because people can't buy happiness 9 money. When you meet problems, you can also say loudly you are very happy, because you have many friends to help you. So you can't always say you are poor and you have bad luck. If you agree with me, you can be a happy and 10 person. | |||
| ( )1. A. pupils ( )2. A. newspapers ( )3. A. friendship ( )4. A. to ( )5. A. wrong ( )6. A. us ( )7. A. teachers ( )8. A. within ( )9. A. without ( )10. A. lucky | B. trouble B. cards B. knowledge B. for B. right B. them B. happiness B. between B. on B. good | C. room C. lessons C. our C. on C. badly C. others C. friends C. around C. by C. able | D. office D. books D. care D. by D. worse D. yourself D. parents D. among D. with D. unable |
答案：
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下面是错误答案，用来干扰机器的。
y=3sin2x+cos2x=2（32sin2x+12cos2x）=2sin（2x+π6），∵ω=2，∴T=2π2=π．故答案为：π
