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During the teenage years, hormonal (荷尔蒙的) changes lead to physical changes like rapid muscle growth, burst in height, and weight gain in both boys and girls.Take a look at the information and height and weight charts for teens presented in this article if the question “How much should I weigh for my age and height” is bothering you.
Average Height and Weight Charts for Teens
Faster growth in kids usually can be noticed at age 8. Genetic factors also determine the physical growth of a child. So, it is perfectly normal for two kids of the same age to have different weights and heights. The following figures should be used as guidelines only.
 
For Boys
For Girls
Age
Height
Weight
Height
Weight
in Years
in Inches
in Pounds
in Inches
in Pounds
12-13
58-62
85-100
60-63
95-105
14-15
63-66
105-125
63-64
105-115
16-17
67-70
130-150
64
115-120
18-20
68-70
150-160
64
125-130
Ideal Body Fat Percentage
Fit men have 14% - 17% body fat.
Fit women have 21% -24% body fat.
Male athletes have 6% -13% body fat.
Female athletes have 14% - 20% body fat.
The ideal body fat percentage varies mainly according to age, sex and the physical        activity of the individual. But it is a fact that some female athletes have body fat as low as        10 % and some male athletes had lower than 4% body fat. So, it can be observed that other than the above mentioned factors, genetic factors also influence the body-fat ratio.
Body Mass Index (BMI)
You may use the following formula to calculate your BMI:
As per SI Units (国际单位) : BMI =" mass" (kg)/[height (meters) ]2
Imperial (英制的) Units 1: BMI =" mass" (Ib. ) x703/[ height (in. ) ]2
Imperial Units 2: BMI =" mass" (Ib. ) x 4. 88/[ height (ft) ]2
Following conclusions can be derived from (得到) calculating the BMI:
BMI Calculated
Conclusion
BMI 18.5~25
Normal or ideal weight
BMI > 25
Overweight
BMI < 18. 5
Underweight
BMI < 17. 5
Extremely underweight
BMI =" 30" or BMI > 30
Obese(病态肥胖的)
BMI =" 40" or BMI > 40
Extremely obese
【小题1】According to the Average Height and Weight Charts for Teens, ____.
A．girls keep on growing taller during the teenage years
B．girls grow faster at the end of teenager years than boys
C．girls grow faster at the beginning of teenager years than boys
D．boys' average weight is always heavier than girls' during the teenage years
【小题2】 Which of the following statements about ideal body fat percentage is RIGHT?
A．Fit men have higher body fat percentage than fit women.
B．Male athletes have higher body fat percentage than fit men.
C．Female athletes have lower body fat percentage than male athletes.
D．Male athletes have much lower body fat percentage than female athletes.
【小题3】After calculating the BMI, you can reach the conclusion whether ____.
A．your weight is normal
B．your hormone level is normal
C．your height is right for your age
D．your body fat percentage is ideal
【小题4】If a boy is 1. 5 meters in height and weighs 68 kilograms, then he is ____.
A．normalB．obese
C．extremely obeseD．underweight
答案：【小题1】C
【小题2】D
【小题3】A
【小题4】B
试题分析：在青少年时期，荷尔蒙的改变会导致身体的变化，在身高和体重上都会改变，男孩和女孩的变化是不一样的。身高和体重的变化是否正常，本文给出了具体的计算方法。
【小题1】C细节理解题。从图表For Boys 12-13岁，身高58-62inches；For Girls12-13岁，身高60-63 inches，可知在青少年初期女孩比男孩长得快。故选C。
【小题2】D细节理解题。根据Ideal Body Fat Percentage部分所提到的，Male athletes have 6% -13% body fat.Female athletes have 14% - 20% body fat.从这里可看出男运动员比女运动员有更低的脂肪。故选D。
【小题3】A推理判断题。根据Body Mass Index (BMI)这一部分，BMI Calculated 计算结果是BMI 18.5~25，得出结论“正常或理想的体重”；计算结果是 BMI > 25，得出结论Overweight“超重”，所以可知通过计算the BMI可得出你的体重是否正常的结论。故选A。
【小题4】B推理判断题。根据Body Mass Index (BMI)中的计算方法，这个1.5米高，重68千克的男孩的BMI是体重除以身高的平方约等于30.7，根据图表中的BMI =" 30" or BMI > 30，说明是Obese(病态肥胖的)，故选B。
考点：这是一篇健康类的说明文。
2015届江西南昌第三中学高三上第四次月考英语试卷（带解析）

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