育才学习网1. 这个英语文章的总结要怎么写 250左右
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。）