练习：
1. What determines your weight?
A)Your working manner.
B)Your eating habit.
C)Your life style.
D)Your genes.
2. What did Jules Hirsch do in his study?
A)He let the eight fat people skip supper.
B)He let the eight fat people skip breakfast.
C) He let the eight fat people run every morning and evening.
D)He gave the eight fat people a liquid formula providing 600 calories a day.
3. What happened to the eight fat people after they left the hospital?
A)They went mad.
B)They killed themselves.
C) They were back to normal weight.
D)They attempted suicide.
4. What did Ethan Sims make his subjects do?
A)Battle their genetic inheritance.
B)Increase their weight.
C)Stay at home.
D)Lower their weight.
5. What did scientists think was true?
A)Each person has a fixed weight range.
B)Each person has a weight range of 9 kg.
C)Each person wants to control his weight.
D)Each person wants to eat to his heart’s content.
答案与题解：
1. D 问题问的是：什么决定了你的体重?A说的是：你的工作方式。B说的是：你的吃饭习惯。C说的是：你的生活风格。D说的是：你的基因。正确答案是D。第一段中有这么一句话：Your genes，not your life habits，determine your weight and your body constantly tries to maintain it.你的基因而不是你的生活习惯决定了你的体重，因此你的身体总是试图保持它。
2. D 问题问的是：Jules Hirsch在他的研究中做了什么?A说的是：他让八个胖子不吃晚饭。B说的是：他让八个胖子不吃早饭。C说的是：他让八个胖子早晚都跑步。D说的是：他给八个胖子一种每天提供600热卡的流食配方。D是正确的。第三段有这么一句话：They were given a liquid formula providing 600 calories a day.他们被给予一种流食配方，每天提供600热卡。
3. C 问题问的是：八个胖子出院后怎么啦? A说的是：他们发疯了。B说的是：他们自杀了。C说的是：他们又回到了原来的体重。D说的是：他们试图自杀。C是正确的。第四段的最后一句话是这样的：But months after the study ended，they were back to normal weight and stayed there.研究结束几个月后，他们的体重又回到了原来的样子并保持不变。
4. B 问题问的是：Ethan Sims让他的调查对象干什么? A说的是：跟他们的基因遗传物做斗争。B说的是：增加他们的重量。C说的是：呆在家里。D说的是：减少体重。第四段有一个句子是这么说的：Ethan Sims，of the University of Vermont，got prisoners to volunteer to gain weight.Vermont大学的Ethan Sims让犯人自愿增加体重。可见B是正确的答案。
5. A 问题问的是：科学家认为什么是对的? A说的是：每个人的体重都有一个适当的幅度。B说的是：每个人的体重幅度是9公斤。C说的是：每个人都想控制自己的体重。D说的是：每个人都想吃得高兴。正确答案是A。最后一段的第一句话是这么说的：The findings also provide evidence for something scientists thought was true-each person has acomfortable weight range.结论还证实了科学家认为是正确的一点，即每个人的体重有一个适当的幅度。
