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              1. 2018高考英語一輪復習構想Unit3Inventorsandinventions課時作業

                2018高考英語一輪復習構想Unit3Inventorsandinventions課時作業
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                Unit 3 Inventors and inventions

                Ⅰ.閱讀理解

                A

                (2017·廣西重點高中考試)

                Weighing too much can damage your health, and obesity is a growing problem for both kids and adults around the world. Sleep might be one answer to the problem.

                A new study has found that elementary school students who slept too little were more likely to gain pounds.

                Past studies have shown a link between sleeping less and weighing more, but scientists have had a tough time determining “which_came_first,_the_chicken_or_the_egg,” says Julie C. Lumeng of the University of Michigan in Ann Arbor. In other words, it hasn't been clear whether kids who weigh too much have trouble sleeping, or whether sleeping less leads to weight gain. Both scenarios (可能出現的情況) seemed equally possible.

                To get a better idea of which causes which, Lumeng and her colleagues interviewed the parents of 785 third graders from around the United States. The parents answered questions about how well their kids slept that year. Three years later, the parents answered the same questions. By sixth grade, 18 percent of kids involved in the study were obese.

                The scientists found no relationship between weight and the students' race or gender. It also didn't matter how strict their parents were, or whether they were boys or girls. Obesity struck all of these groups equally. Instead, sleep seemed to be the key factor. Over the 3 years of the study, the children averaged a healthy 9.5 hours of sleep a night. Some kids, however, slept a lot more-or less-than others.

                For the sixth graders, every hour of sleep above the 9.5-hour average was linked to a 20 percent lower risk of being obese. Sleep appeared doubly important for the third graders. Every extra hour of sleep they got was linked to a 40 percent drop in obesity.

                【解題導語】本文是說明文。一項新的研究發現,睡眠過少的小學生更容易發胖。

                1.What does the underlined sentence in Paragraph 2 imply?

                A. Scientists have found the exact causes of children's obesity.

                B. There is always something difficult to understand through theory.

                C. The cause-effect relationship between weight and s leep isn't clear.

                D. A person's weight has something to do with the amount of his sleep.

                答案與解析:C 考查句意理解。畫線句表示的字面意思是“先有雞還是先有蛋”,結合上下文的內容可知,文章引用這句話是為了表明“是睡眠少導致了肥胖還是肥胖導致了睡眠變少”這個問題還沒有定論。下文的“In other words, it hasn't been clear whether kids who weigh too much have trouble sleeping, or whether sleeping less leads to weight gain. Both scenarios (可能出現的情況) seemed equally possible”是解題的關鍵提示信息。

                2.What did the interview find out?

                A. 9.5 hours of sleep a night is enough for children.

                B. The more a child sleeps, the healthier he will be.

                C. Six graders need much more sleep than third graders.

                D. One's race or gender has nothing to do with his weight.

                答案與解析:D考查細節理解。根據第四段中的“The scientists found no relationship between weight and the students' race or gender”可知選D。

                3.How does the author develop the passage?

                1

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