There’s no easy answer to this question. Your genetic makeup, the physical traits that get passed down1 to you from your parents, plays a big part in determining your size and weight.1__________
But if your parents are smaller than average, you may want to rethink that professiona1basketball career!2__________
The same goes for your body type.3 Have you ever heard someone say a person is “big boned4”? It’ s a way of saying a person has a large frame, or skeleton. Big bones usually weigh more than small bones. ____2 ___
Like your height or body type, your genes have a lot to say6 about what your weight wi11 be. But that's on1y part of the story. Being overweight can run in someone's farnily, but it may not be because of their genes.7—___3__ And even though some kids gain weight more easily than others, when they eat right and exercise , most kids can be a hea1thy and happy weight that's right for them. It' s true — the way you live can change the way you look.
How much you weigh is a ba1ance between calories you eat and the calories you use.
4__________ If you spend your free time watching TV, your body won’t use as many calories as it would if you played basketball, skated, or went for a walk. If you are in balance, your weight will stay right for you as you grow. But if you eat more and exercise less, you may become overweight. 5__________
　　词汇：
　　genetic /d??'net?k/ adj.遗传(性)的;基因的
makeup /me?k?p/ n.组成;构造
trait /treit /n.特征,特点,特性
rethink /ri?'θ??k/ vi.再想,重新思考
　　注释：
　　1.get passed down ：被遗传下来
2.But if your parents are smaller than average, you may want to rethink that professional basketball career!但是如果你的父母比一般人的个头矮小的话,你也许会重新考虑是否还要当职业篮球运动员。
3.The same goes for your body type.你的体型也是如此。
4.big boned：骨骼大的,宽肩
5.That’s why it’s possible for two kids with the same height, but different weights, to both be the right weight.正因为这样,两个身高相同、体重不同的孩子却有可能体重均正常。
6.have a lot to say：起很大作用
7.Being overweight can run in someone’s family, but it may not be because of their genes.身体超重有可能在家族中代代相传,但这也许并非基因所致。
8.lose weight:体重减轻,变瘦
　　练习：
　　A. That’s why it’s possible for two kids with the same height, but different weights, to both be the right weight.5
B. If you eat more calories than your body needs to use, you will gain too much weight.
C. Poor eating and exercise habits also run in families and this may be the reason the members of a family are overweight.
D. However, many overweight people have difficulty reaching their healthy body weight.
E. On the other hand, if you eat less and exercise more, you may lose weight8.
F. If both your parents are tall, there is a good chance you’ll be tall.
　　答案与题解:
　　1. F文章开头表明,一个人的基因构成,即父母遗传给他的身体特征,很大程度上决定了他的身高和体重。接下来的句子应是对此论点的具体阐释:说明父母高矮与你的关系。
2.A前两句表明,人的骨骼有大小之分,而大骨骼通常比小骨骼要重,因此才有可能出现这种现象,即身高相同、体重不同的两个孩子体重均正常。
3.C前一句讲,身体超重有可能在家族中代代相传,但又不是基因遗传所致,接下来的句子就应说明其原因,即不良的饮食习惯与运动习惯也代代相传,而这正可能是家族成员普遍超重的原因。
4.B前一句讲,一个人的体重体现的是所摄入热量与所消耗热量之间的平衡。由此可以推断,摄入的热量如果超过了身体的需要,就会超重。
5.E前一句表明,如果一个人吃得多而运动得少,就有可能超重。“反之亦然”，即“吃得少而运动得多,体重就会减轻”，这显然应该是下一句所表达的意思。
译文：什么造成我现在的体重?
要回答这个问题并不容易。你的基因构成、你父母遗传给你的身体特征在决定你的体型与体重中起了很大的作用。如果你的父母都高的话，那你很有可能会长得高。如果你的父母比一般人个头矮小的话，你或许应当重新考虑是否还要当篮球运动员。
你的体型也是如此。你曾听过有人说别人是“大骨架”吗?这就是说这个人体形魁梧或者骨架大。大骨骼通常比小骨骼要重。正因为这样，两个身高相同、体重不同的孩子却有可能体重均正常。
像你的身高和体型一样，基因对你的体重也起了很大的作用。但那只是部分原因。身体超重可能在家族中代代相传，不过这也许并非基因所致。不良的饮食习惯和 运动习惯也代代相传，而这也正可能是家族成员普遍超重的原因。尽管有些孩子比别人容易增重，但如果他们控制饮食、适量运动，大多数孩子都能保持健康适宜的 体重。你的生活方式能改变你的样子——这是真的。
一个人的体重体现的是所摄入热量与消耗能量之间的平衡。如果摄入热量超过身体所需就会超重。 如果你把空闲时间用来看电视，你就不可能像去打篮球、滑冰、散步那样消耗更多的热量。如果你的热量摄入与消耗持平，你的体重将随着你的成长而保持适宜。但 如果你吃得多而运动少，你就有可能超重。反之，如果你吃得少而运动多，体重就会减轻。