题目内容
Height is just one of the thousands of features 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 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.
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 may be 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.If you want to know how fast and how tall you should grow, ____________.
A. you should have enough exercise B. you can ask doctors for help
C. you should save the environment D. You can record your growth during puberty
2. This passage is mainly about ____________.
A. how the genes work in your body B. when is the time you grow fast
C. why you look like your parents D. how you grow to a certain height
3. After reading this passage, we can explain ___________.
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
4. Which is NOT mentioned in the passage?
A. Your height most probably depends on how high your parents are.
B. Girls’ age for starting puberty is usually earlier than that for boys’.
C. The time showing the first changes of puberty is never noticed.
D. You may be scared sometimes when you grow too fast.
1.B2.D3.D4.C
【解析】略
小学教材完全解读系列答案Short people, studies have shown , are more likely to have a stroke , suffer from high blood pressures and heart disease and be bullied in school .
Now, researchers report that short people—at least in the past—were also more likely to die at a younger age than their taller peers.
Their study, published in the Journal of Epidemiology (流行病学) and Community Health , found that short bones have something to do with short life for more than 1,000 years. The conclusion was based on 490 sets of adult skeletal(骨架) remains from an archaeological(考古学的) site in northeastern England , YC dating from the 9th century to about 1850 .
About 55% of men and 73% of women died before the age of 45, and 39% of men and 56% of women died before age 30. The risk of death before age 30 declined as bone length increased.
“This study provides evidence from an archaeological sample that long bone length is connected with age at death—those with smaller bones tend to die younger,” according to Dr. D.J. Gunnell of the university of Bristol in the UK and colleagues .
While it is not clear why short stature(身材) might be linked to earlier death , the researchers point out that height is an indicator of childhood nutrition, which may have long-lasting effect on health .
“Mechanism (身体结构) for height-mortality(死亡) associations in the past may differ from those today , for example , short stature may have increased the risk of death in childbirth and this may explain the higher risk of premature(未成熟的) mortality in women,” Gunnell and colleagues write .
“However, short bones, it would appear, have always been a marker of a short life,” the authors conclude.
【小题1】The title of the passage should be .
| A．Short people and their taller peers |
| B．Men and women |
| C．Short stature and short life |
| D．Long life and short life |
| A．a study | B．a marker | C．a risk | D．an age |
| A．People with smaller bones were more likely to die younger. |
| B．Women were more likely to die at a young age. |
| C．Short-stature women bear higher risk of death in giving birth to babies. |
| D．Most people were more likely to die at the age of 30 in the past. |
| A．less childhood nutrition | B．heart disease |
| C．some illnesses | D．high blood pressure |
| A．space medicine | B．sports medicine |
| C．social medicine | D．industrial medicine |