Height is just one of the thousands of features that your genes decide．In fact.because you have parents.your genes provide you a height that usually lands somewhere between the height of each parent� 题目和参考答案——青夏教育精英家教网—

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7．Height is just one of the thousands of features that your genes decide．In fact，because you have 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 b e，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．Getting plenty of sleep and enough exercise will help you grow to the expected height．
      No doubt you're wondering how fast you should grow．There's no perfect or right answer．Generally speaking，kids grow about two inches （six centimeters） a year between age 3 and the time when they start puberty．（青春期）．
      Your doctor will know how your growth has been going over the years．How you've been growing up to this point，and what other changes your body may be going through．
       Don't be scared if you 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 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．

66．If you want to know how fast and how tall you should grow，B．
A．you should have enough exercise．
B．you can ask doctors for help．
C．you can record your growth during puberty．
67．After reading this passage，we can explainB．
A．how much sleep time we need．
B．why genes can't decide everything．
C．what healthy diet is．
68．Kids grow aboutCcentimeters your every year from age 3 to puberty．
A.2      B.4   C.6
69．Your height mainly depends on according to the passage．
A．genes           B．diet      C sleep
70．Which of the following is not true according to the passage？
A．you may be scared sometimes when you grow too fast．
B．girl's age for starting puberty is usually earlier than that for boys．
C．the time showing the first changes of puberty is never noticed．

分析短文讲了高度是你的基因决定的．事实上，因为你的父母，你的基因提供给你一个高度，通常地每个父母的身高之间．如果你的父母都高，那么很可能你会高，但是基因并不能决定一切，例如，吃不健康的食物会让你无法充分发挥你的潜力，充足的睡眠和足够的锻炼可以帮助你达到预期的高度．

解答答案：66．B 细节理解题．根据文章内容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．可知你可以寻求医生帮助．故选B．
67．B 根据文章内容For example，eating an unhealthy diet can keep you from growing to your full potential．Getting plenty of sleep and enough exercise will help you grow to the expected height．例如，吃不健康的食物会让你无法充分发挥你的潜力，充足的睡眠和足够的锻炼可以帮助你达到预期的高度．可知基因不能决定一切．故选B．
68．C 细节理解题．根据Generally speaking，kids grow about two inches （six centimeters） a year between age 3 and the time when they start puberty．（青春期）．一般来说，孩子们在3岁和他们开始青春期的时候，一年大约长两英寸（六厘米）．可知大约长6厘米．故选C．
69．C 细节理解题．根据Getting plenty of sleep and enough exercise will help you grow to the expected height．充足的睡眠和足够的锻炼可以帮助你达到预期的高度．可知
睡眠影响你的身高．故选C．
70．C 细节判断题．根据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．你通常会注意到，在你的身体开始显示青春期的第一次变化后，你的身体发育快了一年左右．可知在你的身体开始显示青春期的第一次变化时会注意到．故选C．

点评在通读全文的基础上，根据全文大意，展开逻辑思维，瞻前顾后，认真观察选项，仔细推敲，确定最佳答案．

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