. In which section of a newspaper can we read this passage?

　　A. Ads

　　B. Movies

　　C. Briefs

　　D. Health and Diet

　　29. The passage is mainly about _________.

　　A. the high incidence of heart disease in some countries

　　B. the changes in people’s diet

　　C. the effect of fish eating on people’s health

　　D. the daily fish consumption of people in different cultures

　　30. We can infer from the passage that there are fewer heart disease deaths ________.

　　A. in countries of the yellow-skin race

　　B. in highly-developed countries

　　C. in the countries with high consumption of fish

　　D. in the countries with good production of fish

　　31. The phrase “this relationship” in paragraph 6 refers to the connection between ____and the level of heart disease.

　　A. the amount of fish eaten

　　B. regular fish-eating

　　C. the kind of fish eaten 

　　D. people of different areas

　　D

　　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.

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