75. From the passage we know the author is most probably ______.

　　A. a heart doctor

　　B. a science researcher

　　C. a supporter of healthy eating

　　D. a university student

　　3.阅读下列短文，从每题所给的四个选项（A、B、C和D）中, 选出最佳选项。

　　A chemical important of brain development may play a role in explaining why some people are genetically (由基因决定地) likely to suffer from anxiety and could lead to new treatments, U.S. researchers said.

　　They said highly anxious rats which were kept had very low levels of a brain chemical called fibroblast growth factor 2 or FGF2, compared with rats that were more relaxed. But when they improved the anxious rats’ living conditions — giving them new toys to explore and a bigger cage to live in — levels of this brain chemical increased and they became less anxious.

　　“The levels of this brain chemical increased in response to the experiences that the rats were exposed to. It also decreased their anxiety”. Javier Perez of the University of Michigan said in a telephone interview. “It made them behave the same way as the rats that were relaxed”, he said.

　　In a former study of people who were severely depressed before they died, the team found the gene that makes FGF2 was producing very low levels of the growth factor, which is known primarily for organizing the brain during development and repairing it after injury.

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