决胜大学英语六级听力必备 mode7_大学英语听力

　　between the amount of food the mice eat and their health.

　　The mice are in three groups.

　　All three groups are receiving the same healthy died

　　But the amount of food that each group is receiving is different

　　The first group is eating one cup of food each day,

　　the second is eating two cup and the third group of mice is eating three cups.

　　After three years,

　　the healthiest group is the one that is only eating one cup of food each day.

　　The mice in this group are thinner than normal mice.

　　But they are more active.

　　Also they are living longer.

　　Mice usually live for two years.

　　Most of the mice in this group are still alive after three years.

　　The second group of of mice is normal weight.

　　They are healthy,too.

　　They are active,but not as active as the thinner mice.

　　But they are only living about two years.

　　The last group of mice spends most of the days eating or sleeping.

　　They are not very active.

　　These mice are living longer than the scientists thought

　　about a year and a half.

　　But they are not healthy.

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