问题 解答题

常州体校拟选拔一名帆船运动员参加省大学生运动会,对帆船运动员甲、乙两人在相同的条件下进行了

6次测试,测得他们速度的数据如下:20070316

甲:27,38,30,37,35,31;    乙:33,29,38,34,28,36.

(Ⅰ)将这两组数据用茎叶图表示;

(Ⅱ)根据题中数据,请你在甲乙两人中确定参加省大学生运动会的帆船运动员,并说明理由.

答案

(Ⅰ)由题意可得:这两组数据的茎叶图为:

(Ⅱ)由茎叶图可得:

.
x
=33;  
.
x
=33

S2甲
=
1
6
[62+32+22+22+42+52]=
47
3

S2乙
=
1
6
[52+42+02+12+32+52]=
38
3

∵S2<S2

∴乙比较稳定

∴确定乙参加

阅读理解

阅读理解。

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Swimming cycling, jogging, skiing, dancing, walking or any of dozens of other activities can help your

heart.   1  . Whether it is a structured exercise program or just part of your daily routine, all exercise adds

up to having a healthier heart. Here are some tips for exercise success.

     ☆ Choose activities that are fun and add variety. Develop several activities that you can enjoy.   2   

     ☆ Wear comfortable, properly fitted shoes and comfortable, loose-fitting clothing appropriate for the

weather and the activity.

     ☆ Find a convenient time and place to do activities.   3   . If you miss an exercise opportunity, work

activity into your day another way.

     ☆ Use music to keep yourself entertained.

     ☆   4   Decide what kind of support you need. Do you want them to remind you to exercise? Exercise

with you regularly or occasionally? Be understanding when you get up early to exercise?Spend time with the

children while you exercise? Try not to ask you to change your exercise routine? Share your activity time

with others. Ask your family members, friends or co-workers for help.

      ☆ Don't overdo it, especially at first. You can slowly increase the time and intensity (强度) of your

activities as you become more fit.    5         

☆ Keep a record of your activities. Reward yourself at times. Nothing will inspire you more than success!

A. Try to make it a habit, but be flexible.

B. They all cause you to feel warm and breathe heavily without being out of breath.

C. Be an active role model for your children.

D. That way, exercise will never seem boring.

E. If you are overweight or have a high risk of heart disease, see your doctor for medical advice

    before exercising.

F. Surround yourself with supportive people.

G. Gradually, work up to exercising on most days of the week for 30-60 minutes.

多项选择题