这个英语文章的总结要怎么写 250左右
题目
这个英语文章的总结要怎么写 250左右
答案
A recent study shows that dirt may be good for brain and make children smarter because it is a
natural anti-anxiety drug without side-effects.Dr.Dorothy Matthews,an associate professor of biology at The Sage Colleges in Troy,N.Y.,conducted the experiment.She and her colleagues tested how long the mice took to navigate a maze.The result is that the bacteria-exposed mice ran twice as fast as the controls.Their explanation is like this:Serotonin plays a big role in modulating mood,decreasing anxiety.If one is nervous or frightened,he can’t think straight.So serotonin is of significance for learning.In the experiment,the bacteria-exposed mice showed fewer anxiety behaviors than the non-exposed ones.In another experiment,the researchers removed the bacteria from the food provided for the exposed mice and found that those exposed mice were still faster than the controls.Therefore,they came to a conclusion thatthe effect is temporary.(字数:155,实际已经说清楚了.)
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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