10．Height is just one of the thousands of features （特征） that 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 maybe 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 keep you from growing to your full potential （潜力）．Getting plenty of sleep and enough exercise will help you grow to the expected height．
It's natural that you're wondering how fast you should grow．There's no perfect or right answer．Generally speaking，kids grow about 6centimeters a year between age 3and the time when they startpuberty．
Your doctor will know how your growth has been going over the years.2cm here and 3cm there make a little difference to the height you're at now．How have you been growing up to this height？What other changes may your body be going through？
Don't be amazed if you seem to have grown a lot in a very short time．Everyone has a very quick growth during puberty．The age for starting puberty is about 10for girls and about 11for boys．But it can be earlier or later-between 7and 13for girls，9and 15for boys．
You'll usually begin to notice that you're growing faster about a year after your body starts to show the first changes of puberty．
根据短文内容，选择最佳答案．
36．If you want to know how tall you should grow，B．
A．you should have enough exercise
B．you can ask doctors for help
C．you should take some special medicine
D．you can record your growth during puberty
37．The Chinese for the word"puberty"isD．
A．童年时期
B．婴幼儿时期
C．习惯养成期
D．生长发育期
38．This passage is mainly aboutD．
A．how the genes work in your body
B．how your parents'height influence you
C．how you look like your parents
D．how you grow to a certain height
39．After reading this passage，we can explainC．
A．how good it is to be a doctor
B．how much sleep time we need
C．why genes can't decide everything
D．what healthy diet is
40．Which is NOT mentioned in the passage？C
A．Your height most probably depends on how tall your parents are．
B．Girls'age for starting puberty is usually earlier than that for boys'．
C．The features showing the first changes of puberty between boys and girls are different．
D．You may be amazed sometimes when you grow too fast．
分析 短文大意：这篇短文主要告诉我们，我们的身高最可能取决于你的父母的身高，女孩的青春期一般比男孩开始的较早，以及当你生长过快时，你可能感到焦虑．
解答 36-40：BDDCC
36题答案：B 细节题．根据文章第四段内容Your doctor will know how your growth has been going over the years．你的医生会知道你多年来的成长情况，答案为B
37题答案：D 词汇题．根据前面句子Generally speaking，kids grow about 6centimeters a year between age 3and the time 一般来说，孩子在3岁每年增长约6厘米可知后面：每个人在生长发育期都有发育高峰期．答案为D
38题答案：D 主旨题．根据文章第一段内容Height is just one of the thousands of features （特征） that 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 maybe 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．大意：可知是怎么长到一定的高度，答案为D
39题答案：C 细节题．根据文章内容第二段But genes don't decide everything．可知但基因不能决定一切，答案为C
40题答案：C 细节题．根据文章第一段的句子：In fact，because you have two parents，your genes provide you a height that usually lands somewhere between the height of each parent．事实上，因为你有两个父母，你的基因为你提供了一个高度，通常在每个父母的高度之间，可知A正确，第五段的句子：The age for starting puberty is about 10 for girls and about 11 for boys青春期开始的年龄大约是女孩的10，男孩的11．可知B正确，第五段的句子：Don't be scared if you seem to have grown a lot in a very short time如果你在很短的时间内成长了很多，不要害怕可知D正确，可知答案为C
点评 题目涉及多道细节理解题，做题时结合原文和题目有针对 性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．
