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  3. （非英语类学生必做） The average person swallows about half-a-ton of food a year—not counting drink—and though the body is remarkably

（非英语类学生必做） The average person swallows about half-a-ton of food a year—not counting drink—and though the body is remarkably

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问题 （非英语类学生必做）
    The average person swallows about half-a-ton of food a year—not counting drink—and though the body is remarkably efficient at extracting(摄取) just what it needs from this huge mixture, it can only cope up to a point. If you go on eating too much of some things and not enough of others, you’ll eventually get out of condition and your health will suffer. So think before you start eating. It may look good. It may taste good. Fine! But how much good is it really doing you?
    What you eat and the way it affects your body depend very much on the kind of person you are. For one things, the genes you inherit from your parents can determine how your body metabolism(新陈代谢) copes with particular foods. The tendency to put on weight rather easily, for example, often runs in families which means that they have to take particular care.
    And your parents may shape your future in another way. The way you are brought up shapes some basic attitudes to food—like whether you have a sweet tooth, nibble (吃零食) between meals, take big mouthfuls or eat chips with everything. Eating habits, good or bad, tend to get passed on.
    And then there is your lifestyle. How much you spend on food (time as well as money) , how much exercise you get—these can alter the balance between food and fitness.
    And finally, both your age and your sex may affect this balance. For example, you’re more likely to put on weight as you get older, especially if you’re a woman.
    So everybody is different and the important thing is to know yourself.  
We can infer from the passage that______.
选项 A、in order to keep fit, we should spend as little time and money as possible on food
B、nibbling between meals is a bad habit that will throw our body out of condition
C、if other members of our family get fat quite easily, we probably will too
D、we can eat as much as we want and leave it to our body to select what it needs
答案C
解析 第二段提到我们遗传自父母的基因将决定我们身体对于特定食物的新陈代谢功能如何。由此推断出如果我们家庭里有成员容易发胖。那意味着我们体内也有相同的基因，那么显而易见的是我们也会容易发胖。
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