C. Intelligent children tend to belong to higher social class later in life.

　　D. Children with a healthier heart tend to have a higher IQ later in life.

　　[解析]　细节理解题。根据第一段中的“people who were vegetarians by 30 had recorded five IQ points higher on average at the age of 10”可知A项正确。根据“it could explain why...”可知这一结果可帮助解释B项中的现象，但B项并非这次研究的结果。故本题选A。

　　[答案]　A

　　2．It was found in the research that________.

　　A. most of the participants became vegetarians 20 years after the IQ tests were carried out

　　B. vegetarians who ate fish or chicken were of similar intelligence with strict vegetarians

　　C. female vegetarians were more likely to have higher annual income than non-vegetarians

　　D. vegetarians were more likely to have higher annual income than non-vegetarians

　　[解析]　细节理解题。根据第三段中的“There was no difference in the IQ scores between strict vegetarians and those who said they were vegetarians but reported eating fish or chicken”可知答案。

　　[答案]　B

　　3．Catharine Gale talked about “being vegetarians” in a(n)________way.

　　A. doubtful

　　B. favorable

　　C. negative

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