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题型:阅读理解-单选 难度:0.65 引用次数:13 题号:22777800

Height is just one of the thousands of features (特征) your genes (基因) decide. In fact, because you have two parents, your genes provide you a height that usually lands somewhere between the height of each parent. If both your parents are tall, then most probably you will be tall, too, but if you have questions about how tall you’re going to be, ask your doctor if he or she can help you find it out.

But genes don’t decide everything. For example, eating an unhealthy diet can stop you from growing to your full potential (潜力). Getting plenty of sleep and enough exercise will help you grow to the expected (期待的) height.

No doubt (怀疑) you’re wondering how fast you should grow. It depends. There’s no perfect or right answer. Generally speaking, kids grow about 2 inches (6 centimeters) a year between age 3 and the time when they start puberty (when your body starts changing and becoming more grown up).

Your doctor will know how your growth has been going over the years. Two centimeters here and 2 inches there are not nearly as important as the height you’re at now, how you’ve been growing up to this point, and what other changes your body maybe going through.

Don’t be scared if you seem to have grown a lot in a very short time. Everyone has a growth spurt (高峰) during puberty. The age for starting puberty is about 10 for girls and about 11 for boys. But it can be earlier or later — between 7 and 13 for girls and 9 and 15 for boys.

You’ll usually begin to notice that you’re growing faster about a year or so after your body starts to show the first changes of puberty.

1. The Chinese for the undelined word “puberty” is ________.
A.童年时期B.婴幼儿时期C.习惯养成期D.生长发育期
2. If you want to know how fast and how tall you should grow, ________.
A.you should have enough exerciseB.you can ask doctors for help
C.you should save the environmentD.you can record your growth during puberty
3. After reading this passage, we can explain (解释) ________.
A.how good it is to be a doctorB.how much sleep time we need
C.why genes can’t decide everythingD.what healthy diet is
4. This passage is mainly about ________.
A.how the genes work in your bodyB.when is the time you grow fast
C.why you look like your parentsD.how you grow to a certain height
【知识点】 科普知识 说明文

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【推荐1】“Early to bed and early to rise make a man healthy, wealthy and wise.” This is an old English saying. It means that when we go to bed early, we can get up early the next morning. Then we will become healthy. We will also become rich and clever.

This is true. To keep healthy, we must have enough sleep. Experts(专家) say that adults(成人) should get seven to eight hours of sleep a night. Teenagers need nine to ten hours of sleep. And school-aged children may need more than ten hours of sleep. Children who do not have enough sleep can’t do their work very well. They won’t be wise and they may not become wealthy!

We also need exercise. Walking, running, swimming and playing games are all exercise. Exercise keeps us strong. It also helps the blood to move around the body. This is very important. Our blood takes the nutrition(营养) from food to all parts of our body.

The head also needs blood. So exercise that moves the blood to our head helps us think better!

1. What does the underlined word “rise” mean?
A.Stand up.B.Get up.C.Sit down.D.Do exercise.
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I went paragliding in Peru’s Sacred Valley, from a mountain more than 3, 000 meters above sea level. The most difficult part of paragliding for me was not the flying, but the waiting. I started to feel nervous about watching others go ahead of me. But the pilot helped keep me composed. So I didn’t feel nervous.

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