题目内容
D
Is a recently discovered hormone the reason why folks who lose weight can’t keep it off?
Like millions of other fat people, at 530 inches high, more than 300 pounds, Carnie Wilson was not just fat. After trying all sort of diets that didn’t work, she has to go to the stomach – bypass surgery (胃部迂回手术), ie, have most of her stomach sewed up, only leaving tiny room to hold several tablespoonfuls at most. Result: she simply couldn’t eat the way she used to. In three years, Wilson is one third of her former weight.
Wilson’s experience is not all that unusual, and while doctors still aren’t exactly sure what is going on, a report in last week’s Journal of Medicine offers an explanation. The loss of appetite in bypass patients may be linked to a recently discovered hormone called ghrelin. Not only that, ghrelin may turn out to be one reason we feel hungry and it’s hare for didters to keep weight off.
Nowadays, researchers are careful to stress only what they know for sure. For the three conclusions, the leading Dr. David of the University of Washington says, “I feel very solid about two of them.” The first is that ghrelin levels in the bloodstream rise significantly before meals and drop afterward. The second conclusion is that ghrelin levels are higher on average in people who have lost weight from dieting.
Dr. David is less sure of the third conclusion, that bypass patients have only a quarter as much ghrelin as most people of normal weight. After all, ghrelin is produced by cells in the stomach. Years ago, leptin, a hormone was found as an appetite suppressant (食物抑制剂). But after years of trying, it had to be given up.
What doctors suspect is that both leptin and ghrelin are part of a complex system of brain and body chemicals that govern weight and appetite. That does not mena pharmaceutical (药物的) weight control is forever out of the question. “In the next ten years, we will be able to develop new drugs to help people lose weight healthily and effectively.”
47.What can we learn about ghrelin according to the passage?
A.After meals ghrelin levels are higher in the bloodstream.
B.People who have lost weight have less ghreilin in their body.
C.Without ghrelin, people are really difficult to lose weight.
D.Ghrelin is something produced by cells in the stomach.
48.What is Dr. David not sure?
A.pharmaceutical weight control is impossible. B.There is less ghrelin in the bypass patients.
C.new drugs will be developed in 10 years.
D.ghrelin levels are higher in people on diet.
49.In fact, people’s weight and appetite are controlled by
A.ghrelin and leptin B.hormone and medicine
C.brain and body chemicals D.stomach and food
50.What can we infer from the passage?
A.People with a lower ghrelin level go hungry easily.
B.Doctors managed to use leption to control the appetite.
C.Doctors are optimistic about how to lose weight healthily.
D.The loss of appetite in bypass aptient is linked to leptin
47—50 DBCC
解析

最近的一项调查表明,大约有30%的高中生养成不吃早餐的习惯。请根据表格内容用英语写一篇题为“Top Meal of the Day”的短文刊登在英语学习辅导报上。
原因: |
1.晚上学习太晚,不吃早餐可多睡一会儿; |
2.家长太忙无暇顾及,给钱让孩子自己解决; |
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3.一些女孩子为保持苗条身材而一些男生则为了减肥不吃早餐。 |
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结果: |
1.课上注意力不能集中; |
2.考试成绩不理想。 |
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建议: |
1.早餐不可少.它提供全天所需能量的30%,且有助于创造能力的培养; 2. 自己的建议(至少2点) |
注意:1.短文须包括所有要点,但不要逐字翻译;可以适当增加情节,使内容连贯。
2.词数: 120 ~150 ;文章的开头已给出,不计入总词数内。
3.参考词汇: 创造能力 creative abilities
Top Meal of the Day
A recent study shows that nearly 30 percent of the high school students do not have breakfast._______________________________________________________________________________________________________________________________________________________