【題目】During the teenage years, hormonal (荷爾蒙的) 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 (國際單位) : 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(病態(tài)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】本文是一篇說明文給出了一些數(shù)據(jù)來說明青少年在成長的過程中的身體素質(zhì)如何，從生長速度、體脂以及BMI指數(shù)三方面給出了科學(xué)的計算方式和數(shù)據(jù)。

【1】細(xì)節(jié)題。根據(jù)表一中的男孩和女孩數(shù)據(jù)對比，12-13歲男孩體58-62英寸，85-100磅；同年齡段女孩身高60-63英寸，體重95-105磅。明顯比男孩要重并且各自高，后來的幾年女孩的生長速度就降下來了。故選C

【2】細(xì)節(jié)題。根據(jù)理想體脂率那一部分的數(shù)據(jù) Male athletes have 6% -13% body fat.男運動員體脂率為6-13%；Female athletes have 14% - 20% body fat.女運動員體脂率為14-20% 。故選D

【3】分析推斷題。根據(jù)最后一個表格我們可以看到左邊是BMI數(shù)值，右邊是對應(yīng)數(shù)值的評價。右邊評價的描述是普通體重、低于一般體重，肥胖等體重的評價指標(biāo)，故選A。

【4】分析推斷題。根據(jù)最后一個表格我們可以看到左邊是BMI數(shù)值，右邊是對應(yīng)數(shù)值的評價，在表格上方有計算公式用體重除以身高的平方根據(jù)題目得到的數(shù)據(jù)算出BMI數(shù)值為30.22所以是肥胖。故選B

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