精英家教网 > 高中英语 > 题目详情

Crossing your legs is an extremely common habit; most people don't even notice that they're doing it when they sit down. While you may find it comfortable to sit with one knee crossed over the other, it might be causing health problems that you are not aware of.

A study published in Blood Pressure Monitoring stated that sitting with your legs crossed can increase your blood pressure. The reason for this is that the blood in your legs has to work against gravity to be pumped back to your heart and that crossing one leg over the other increases resistance, making it even harder for the blood to circulate. This causes your body to increase your blood pressure to push the blood back to the heart. You won't feel any immediate effects, but repeated, drawn-out increases in blood pressure can cause long-term health issues. So, planning to sit for a long period of time? Don't keep your legs crossed.

Crossing your legs at the knee can also cause pressure on the major nerve in your leg that passes just below your knee and along the outside of your leg, explains Richard Graves, a medical expert. This pressure can cause numbness and temporary paralysis (麻痹) of some of the muscles in your foot and leg, preventing you from being able to raise your ankle—what we know as that “pins and needles” sensation. While the feeling of discomfort may only last a minute or two, repeatedly crossing your legs until they feel numb can cause permanent nerve damage.

So next time you sit down, try to get yourself in the habit of sitting with both of your feet on the floor. Not only will it help your posture and stability, but it will also save your health in the long run.

1.What can we learn about crossing one's legs?

A. It is a very bad social habit.

B. It is usually practiced deliberately.

C. It can do harm to people's health.

D. It can make others feel uncomfortable.

2.According to the study, sitting with your legs crossed can______.

A. affect your blood pressure

B. resist gravity effectively

C. lead to heart attacks easily

D. improve the function of legs

3.In the third paragraph "pins and needles" probably means______.

A. slight sharp pains

B. being a little nervous

C. serious muscle injuries

D. being highly flexible

4.What is the main purpose of the text?

A. To compare common habits.

B. To give readers some advice.

C. To evaluate effects of an experiment.

D. To introduce research methods.

练习册系列答案
相关习题

科目:高中英语 来源:吉林省长白山市2017届高三第二次模拟考试英语试卷(有答案) 题型:短文填空

In order to know a foreign language thoroughly, four things are necessary. Firstly, we must understand the language when we hear 1. spoken. Secondly, we must be able to speak it ourselves correctly with confidence and without hesitation. 2., we must be able to read the language, and fourthly, we must be able to write it. We must be able to make sentences that are grammatically correct.

There is no easy way to success 3. language learning. 4. good memory is a great help, but it is not enough only 5. (memorize) rules from a grammar book. It is not much use learning by heart long lists of words and 6. meanings, studying the dictionary and so on. We must learn by using the language. 7. we are satisfied with only a few rules we have memorized, we are not really learning the language. “Learn through use” is a good piece of 8. (advise) for those 9. are studying a new language. Practice is important. We must practice speaking and 10. (write) the language whenever we can.

查看答案和解析>>

科目:高中英语 来源:山西省太原市2016-2017学年高一3月阶段性测试英语试卷 题型:完成句子

Wilson ___________considerable success as an artist during the past few years.

查看答案和解析>>

科目:高中英语 来源:西藏日喀则市2016-2017学年高一上学期期末考试英语试卷 题型:短文改错

One day I told Mr. Wang, our math teacher, was ill. I was worried about him and went to see him after

the school. When I enter his room, he struggled up to welcome me. I let him lay down again. Mr.

Wang looked pale. I asked about his trouble. He said he was having a bad cold. Then he has a bad

cough. After take some medicine he was getting better. He asked me that we liked the teacher who

took place. When he heard everything was all right, I could see he was pleasing. Finally I asked

him don’t to worry about the work and have a good rest.

查看答案和解析>>

科目:高中英语 来源:安徽省合肥市2017届高三第二次教学质量检测英语试卷(有答案) 题型:短文改错

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1.每处错误及其修改均限一词;

2.只允许修改10处,多者(从第11处起)不计分。

Nowadays many people drive instead of taking a bus or walking to work. It causes more traffic jam: and accidents. As the student, what can we do to guarantee our safe? First of all, the traffic rules must be strict obeyed. When we cross streets, wait until the traffic light turn green. Next, don't forget walk on the pavement. Finally, I think it very dangerously to wear headphones while walking or cycling. Since we can't pay enough attention on the traffic around us, so accidents may happen. Taking good care of ourselves and don't let our parents worry about us.

查看答案和解析>>

科目:高中英语 来源:2016-2017学年浙江省高一3月阶段性考试英语试卷(解析版) 题型:短文填空

In much of Asia, especially the so-called “rice-bowl” cultures of China, Japan, Korea, 1. Vietnam, food is usually eaten with chopsticks.

Chopsticks are usually two long, thin pieces of wood or bamboo. They can also be made of plastic, animal bone or metal. Sometimes chopsticks are quite artistic. Truly elegant chopsticks might 2. (make) of gold and silver with Chinese characters. Skilled workers also combine various hardwoods and metal 3. (create) special design.

The Chinese have used chopsticks for five thousand years. People probably cooked their food in large pots, 4. (use) twigs(树枝) to remove it. Over time, 5. the population grew, people began cutting food into small pieces so it would cook more quickly. Food in small pieces could be eaten easily with twigs which 6. (gradual) turned into chopsticks.

Some people think that the great Chinese scholar Confucius, 7. lived from roughly 551 to 479 B.C., influenced the 8. (develop) of chopsticks. Confucius believed knives would remind people of killings and 9. (be) too violent for use at the table.

Chopsticks are not used everywhere in Asia. In India, for example, most people traditionally eat 10. their hands.

查看答案和解析>>

科目:高中英语 来源:浙江省2016-2017学年高二3月阶段性考试英语试卷 题型:书面表达

联合国教科文组织(UNESCO)在1995年宣传每年的4月23日为“世界读书日”(World Book Day)。假设你是你们学校的学生会主席,请你写一篇讲稿,向全校同学简要介绍“世界读书日”并呼吁同学们多读书。内容包括:

简述“世界读书日”(发起时间及目的);

讲述读书的益处;

呼吁同学们多读书,读好书。

注意:

1.词数80左右;

2.可适当增加细节,以使行文连贯。

My dear fellows,

The Students’ Union

查看答案和解析>>

科目:高中英语 来源:2017届青海省西宁市高三上学期期末同步练习考试英语试卷(解析版) 题型:短文改错

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1. 每处错误及其修改均仅限一词; 2. 只允许修改10处,多者(从第11处起)不计分。

On Monday, I was riding my bicycle to school. I was worried I'd be late for school because the heavy traffic. Suddenly, a car came towards me and passes very close to me at high speed. This caused me to lose my balance, that resulted in me fall off the bicycle. As a result, I injured in my ankle quite badly. I didn't know a speed at which the vehicle was traveling but obvious it appeared to me that it passed by me very quickly.

As I was falling onto the grounds, I saw the car crash into a white car. Therefore, the driver didn't stop and check what he had done. He just drove away. I really hope the driver could realize her fault and shoulder his responsibilities.

查看答案和解析>>

科目:高中英语 来源:四川省广元市2017届高三第二次高考适应性统考英语试卷(有答案) 题型:阅读理解

Forget about the “post-1995 generation”. Young people born in 1995 or later have another name in English—Generation Z.

Now entering adulthood and soon to join the workforce, Generation Z grew up in a special period of time—a time in which technology developed fast, social changes happened every day, the internet became universal and, sadly, so did global terrorism.

It is believed that Generation Z is the generation that is going to shape our future, which is why policy makers, sociologists and company leaders are trying their best to understand these young people.

So, what are Gen Z-ers really like?

Most people agree that the single biggest difference between Gen Z and other generations is how connected they are. This is a group of people who have been familiar with social media as soon as they were born. Social media has changed the way Gen Z-ers communicate with each other and how they get and understand information.

“We are the first true digital natives. I can almost create a document, edit it, post a photo on Instagram and talk on the phone, all at the same time,” said Hannah Payne, an 18-year-old student at UCLA, according to The New York Times. “Generation Z takes in information very fast and loses interest just as fast.”

It may be true that Generation Z-ers have a shorter attention span (注意力持续时间) than a goldfish, but since they grew up among social changes, they are more active in politics. According to the British Election Study, 58 percent of 18-to-24-year-old voted in the 2015 general election in the UK, a big jump from 38 percent in 2005.

Generation Z-ers are also culture creators. “Growing up with the internet has freed this generation from traditional cultural expression.” Wrote Grace Masback, a Huffington Post blogger and a Gen Z-er herself. According to Masback, these young people are no longer willing to let their creativity be limited by their parents of traditional rules. They watch videos and read news online instead of on TV, and they share their experiences on social media.

“We decide what kind of content we want to experience and choose how we experience it,” wrote Masback.

1.Which is TRUE about Gen Z-ers, according to the article?

A. Face-to-face communication is challenging for them.

B. Often doing many things at the same time affects their efficiency.

C. They don’t bother to think about the information they take in carefully.

D. They show more interest in politics than in other fields.

2.What can we infer from the last two paragraphs?

A. Gen Z-ers enjoy great freedom to express themselves.

B. Gen Z-ers enjoy teaching their parents about new cultural trends.

C. Gen Z-ers are against traditional culture.

D. Gen Z-ers are unwilling to obey their parents.

3.Which word can best describe the author’s attitude towards Generation Z?

A. Worried B. Critical C. Appreciative D. Neutral(中立的)

查看答案和解析>>

扫码下载作业精灵
同步练习册答案