If you know something is bad for you, why can’t you just stop? About 70% of smokers say they would like to stop. Drug and alcohol abusers (滥用者) struggle to give up the bad habits that hurt their bodies and destroy families and friendships. And many of us have unhealthy weight that we could lose if only we would eat right and exercise more. So why don’t we do it?

Some scientists have been searching for answers. They’ve studied what happens in our brains as habits form. They’ve found answers to why bad habits, once formed, are so difficult to kick. And they’re developing ways to help us make the changes we’d like to make.

Habits are a normal part of life, and are often helpful. “ We wake up every morning, shower, comb our hair or brush our teeth without being aware of it,” Volkow says. We can drive along familiar routes without really thinking about the directions. “When behaviors become automatic(不加思索的), it gives us an advantage, because the brain does not have to perform the action on purpose.” Volkow says. This frees up our brains to focus on different things.

One way to kick bad habits is to focus on your unhealthy habits. Then try your best to stop them. For example, habits can be linked in our minds to certain places and activities. You could develop a plan, say, to avoid walking down the hall where there’s a candy machine. Try to avoid going places where you’ve usually smoked. Stay away from friends and situations linked to problem drinking or drug use.

Another helpful way is to replace unhealthy habits with new, healthy ones. “It doesn’t work for everyone,” Volkow says. “But certain groups of patients who have a history of taking a drug can do something else like running and it helps them stay away from drugs.”

1.In the first paragragh the writer mainly wants to tell us ______.

A. we should stop something bad for us

B. most smokers would like to stop smoking

C. bad habits are really difficult to give up

D. eating right and exercise more can lose weight

2.Scientists studied what happened in our brains as habits form in order to______.

A. find answers to solve the problem

B. find ways to form good habits

C. kick their own bad habits

D. help us see how bad habits form

3. If you want to kick bad habits you’d better_______.

A. focus on them on purpose

B. go to the places linked with them

C. do something linked with them

D. ask your friends for help

4.What is the main idea of the passage?

A. Breaking bad habits.

B. Forming good habits.

C. Finding reasons for bad habits

D. Replacing bad habits with good ones.

Earth Day has come and gone, but it’s a fact of daily life that 1.6 billion people around would have no electricity in their homes. Instead, most of them use wood, coal or even animal waste to heat and cook in their homes ,which also gives off greenhouse gases, causing indoor air pollution that kills 1.6million people a year, most of whom are children and women.

It’s not expected to improve much, and in Africa it’s becoming worse now. By 2030, when the Earth’s population will be likely to top 8billion, 1.3 billion people will still lack electricity. Of those, 700 million will be in Africa, and 490 million in South Asia.

Ghana, in West Africa, most of the northern half of the country lives without lights. As a result, three out of four Ghanans in the north are without electricity to refrigerate with and to cook with, to study with and to start businesses with. Like most others around the world in the same situation, these Ghanans use traditional fuels( wood, coal, animal waste) to meet their cooking needs.

What would electricity for everyone around the world cost? The International Energy Agency, which is made up of 28 member countries, figures it would run35 billion dollars a year from 2008 to 2030 to reach that.

The United Nations has been busy with the issue, organizing a meeting on April 28 hosted by Secretary-General Ban Kimoon. ‘ Energy services are very important formeeting basic human needs, reducing poverty, creating and getting together wealth and keeping advances in social development,” He said in an announcement.

1.How many people still lack electricity in the world now?

A. 1.6 billion. B. 1.6 million

C. 1.3 billion D. 700 million

2. Why do many children and women die of indoor air pollution?

A. Because they would rather heat and cook with traditional fuels than with electricity.

B. Because of no electricity they have to use traditional fuels for heating and cooking.

C. Because wood, coal or animal waste does great harm to their health.

D. Because there are too many greenhouse gases from factories.

3.The underlined word “that” probably refer to______.

A. electricity for everyone B. 35 billion dollars a year

C. traditional fuels D. 28 member countries

4.What can we learn from the last paragraph?

A. The United Nations is trying to solve the problem.

B. The basic human needs are reducing poverty.

C. Working together is a way to develop.

D. The basic needs for humans are energy services.

完形填空

It happened to me several years ago when I was with my parents and sister on _________ on a farm close to Medellin. We were in a car, and it was 2:00 in the morning. We came across a car _________

As is known to all, it is _________ in some places in Colombia to stop and help strangers because it can be risky (危险的);you can be _________ . Actually, I have heard of so many _________ in which people have been robbed just because they stopped and tried to help people who _________ to need help from the passers-by.

_________ , we didn't know whether to stop or not ; but in the end , _________ , we decided to do it. They had really had a car accident and some of them were _________ . We took them to the hospital. They were really _________ , and we also felt very good about helping them.

I remember the next day when we 51 my grandfathers and uncles about that, they said we shouldn’t have _________ because it was too dangerous. They thought we were _________ because we were able to tell the _________ and still take a vacation on the farm. They _________ us never to do that again.

I think it was risky, but it was worth taking the _________ . Otherwise, we would always have _________ if it was real. Also, if we hadn’t helped them, who knows what would have _________to them.

I believe that one of the reasons why we made up our mind _________ to stop was the fact that we were four people in the car. Maybe if I had been by myself_________I wouldn’t have stopped.

1.A. duty B. time C. show D. vacation

2.A. robbery B. accident C. trade D. race

3.A. convenient B. dangerous C. kind D. difficult

4.A. robbed B. praised C. appreciated D. punished

5.A. passers-by B. cars C. cases D. problems

6.A. refused B. offered C. pretended D. decided

7.A. However B. So C. Otherwise D. Yet

8.A. unluckily B. unwillingly C. unexpectedly D.luckily

9.A.caught B.wounded C. killed D. injured

10.A.thankful B. risky C. peaceful D. frightened

11.A.told B. spoke C. informed D. reminded

12.A.survived B. stopped C. driven D. run

13.A.brave B. kind C. lucky D. stubborn

14.A message B. report C. joke D. story

15.A. advised B. suggested C. persuaded D. forced

16.A. advice B. trouble C. risk D. trip

17.A. wandered B. wondered C. remembered D.regretted

18.A. happened B. faced C. meant D. given

19.A. brains B. decisions C. intentions D. minds

20.A. in the future B. at that time C. at times D. time and again

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