[题目]During the teenage years, hormonal 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 题目和参考答案——青夏教育精英家教网—

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【题目】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 fat. So, it can be observed that other than the above mentioned factors, genetic factors also influence the body-fat rct that some female athletes have body fat as low as 10 % and some male athletes had lower than 4% body faatio.

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

【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

【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.

【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

【4】If a boy is 1. 5 meters in height and weighs 68 kilograms, then he is ____.

A. normal B. obese

C. extremely obese D. Underweight

【答案】

【1】C

【2】D

【3】A

【4】B

【解析】本文是一篇说明文给出了一些数据来说明青少年在成长的过程中的身体素质如何，从生长速度、体脂以及BMI指数三方面给出了科学的计算方式和数据。

【1】细节题。根据表一中的男孩和女孩数据对比，12-13岁男孩体58-62英寸，85-100磅；同年龄段女孩身高60-63英寸，体重95-105磅。明显比男孩要重并且各自高，后来的几年女孩的生长速度就降下来了。故选C

【2】细节题。根据理想体脂率那一部分的数据 Male athletes have 6% -13% body fat.男运动员体脂率为6-13%；Female athletes have 14% - 20% body fat.女运动员体脂率为14-20% 。故选D

【3】分析推断题。根据最后一个表格我们可以看到左边是BMI数值，右边是对应数值的评价。右边评价的描述是普通体重、低于一般体重，肥胖等体重的评价指标，故选A。

【4】分析推断题。根据最后一个表格我们可以看到左边是BMI数值，右边是对应数值的评价，在表格上方有计算公式用体重除以身高的平方根据题目得到的数据算出BMI数值为30.22所以是肥胖。故选B

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