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A×××【解析】本题考查洛伦兹力下的圆周运动。设正电子运动轨迹的圆心角为a,负电子运动轨迹的圆心角为3，由几何知识得到a=20,3=2π0一20，正电子在磁场中运动的时间t1=20T,负电子在磁场中运动的时

Housework not good exercise, says study

1. It even said that people who did the most housework were usually the most overweight. 2. The contribution of domestic physical activity to meeting current recommendations for health. It questions whether activities like do-it-yourself, gardening and housework are good exercise. 3. but there is a danger that people incorrectly think housework is proper exercise.

A total of 4,563 adults took a survey about their weekly physical activity. 4. Researcher Professor Murphy said any physical activity should increase the amount of calories burnt. 5. She said housework was “inversely related to leanness”. She said this suggested that either people overestimate how hard housework was an exercise, or they eat too much because they think they have lost lots of calories doing household chores.

However, her study found the opposite.

People who do housework usually eat more.

A new study says housework is not the quality exercise many people think it is.

The research showed that people who included housework as exercise tended to be heavier.

The study is called Does “doing housework keep you healthy” ?

They think doing exercise is of great benefit to healthy.

It says any activity is better than none.

试题答案

1.C

2.E

3.G

4.D

5.A

【解析】

1.小题1】根据标题：研究显示做家务劳动不是好的锻炼途径。得知首段点明主题：一项新的研究称家务劳动不像很多人想象的是高品质锻炼方式，据说做家务多的人会是超重人群。选C。

2.小题2】根据下文对研究的描述：它质疑动手活动、园艺、家务是否是好的锻炼得知，首先介绍研究的名称—-是做家务真的能使你健康吗？选E。

3.小题3】根据下一句转折说存在一个危险：人们错误认为通过做家务可以锻炼身体，得知上句说虽然有任何活动总比没有要好。选G。

4.小题4】根据上一句有4563人参与调查，得知调查显示通过做家务锻炼的人体重更重。选D。

5.小题5】Murphy 教授说任何活动应该增加燃烧体内热量，下一句表示转折，然而她的调查却得到相反结果，她说家务是与瘦相反的。选A。

考点：调查研究类文章

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