综合写作小练~

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帮忙修改下语法和结构上的问题，谢啦。。还有4天要考试了。作文都没怎么好好练过，也不是很了解。自己估了下，写完这篇20分钟出头了点。。就帮忙看下语法和结构问题，给点建议，谢谢啊。！
还有个问题啊，就是有时候做的综合写作练习听力里讲的是一个列子，有时候都找不到三点原则。。怎么办啊？。

In the lecture, the professor made several examples to paint a very different picture of same-age peer groups from the one in the reading, demonstrating that children study and play with other children of the same age isn't a good way for them.
  The first example showed in the lecture is that children with same age together will show their competetions to others. According to professor, there are 2 groups of children and they showed their competetives and tease to others naturally. This differs from the reading that the same-age peer groups are both equals and usually friends.
Another important point that the professor uses to cast doubt on the reading is that the same-age peer groups will show a negative attitude. In other words, if the same-age peer groups have a game and compete for the winner prize, they are going to insult to each other. This contradict what the reading indicates that peers have the same power and their same age situation can promote cooperation and group identity.
Finally, the professor states that in the same-age peer group, the conflicts exist. The professor demonstrates that the competetion is more narually showed than cooperation. However, the reading presents a conflicting point that the same-age peer groups will promote their own socialization and it's healthy and necessary for survival in a competitive society.
In general, the professor discusses the problem of the same-age peer groups causes negative attitude that the reading views in a different angle.