●9. ________ in the Woodcock Johnston III Tests of Achievement between the two groups

　　● Gum­chewers having better final grades

　　Ⅲ. Researchers' Analysis:

　　◆ Chewing gum reduces 10. ________.

　　◆ Chewing gum increases arousal.

　　【答案及解析】

　　1. better academic performance / higher marks　概括改写题。根据全文内容， 尤其是第一段内容可推知。

　　2. oral health　直接题。根据倒数第二段Researchers say that the studies and research are focused on investigating the effect of chewing gum on focus, alertness, concentration, situational stress, weight control and oral health. 可得知。

　　11

　　【答案及解析】

　　3. his colleagues/team　直接题。根据第二段Study leader Craig A. Johnston of the Children's Nutrition Research Center at Baylor College of Medicine in Houston, Texas, and his colleagues studied…可得知。

　　4. over 100 / more than 100　直接题。根据第二段…more than 100 eighth­grade students, 52 girls and 56 boys, aged between 13 and 16 years, in four math classes.可得知。

　　12

　　【答案及解析】

　　5. 14 weeks　直接题。根据第三段Johnston and his team found that 14 weeks later可得知。

　　6. math class(es)　直接题。根据第二段They chewed at least one stick of gum 86 per cent of the time they were in math class and 36 per cent of the time they were doing homework.可得知。

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