It’ s suggested by experts that teenagers ___...

It’ s suggested by experts that teenagers ____at least 30 minutes exercising, five times a week.

A．spend            B．to spend          C．spent             D．have spent

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Experts suggest that teenagers spend at least 30 minutes exercising, five times a week. Walking and riding your bike _____ , and ______.

A. counts; so are school sports         B. count; school sports count, either

C. count; so do school sports          D. counts; so school sports do

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Experts suggest that teenagers _____ at least 30 minutes exercising, five times a week.

A. have spent　　　　 B. should spend

C. will spend　　　　 D. would spend

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It’s suggested that everyone should_______ at least one hour a day to keep fit.

A. work for               B. work out           C. work at            D. work on

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It is difficult, so I suggest that you __ it to an expert.

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Many good suggestions were _______ at the meeting to cheer up teenagers to be more confident.

A. added to   B. figured out          C. got across       D. put forward

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A new study suggests that the more teenagers watch television, the more likely they are to develop depression(情绪低落) as young adults.

The researchers used a national long-term survey of adolescent(青少年的)health to survey the relationship between media use and depression. They based their findings on more than 4,000 adolescents who were not depressed when the survey began in the year 2000.

As part of the survey, the young people were asked how many hours of television or videos they watched daily. They were also asked how often they played computer games and listened to the radio. Media use totaled an average of five and one-half hours a day. More than two hours of that was spent watching TV.

Seven years later, in 2007, more than seven percent of the young people had signs of depression. The average age at that time was twenty-one.

The researchers say they did not find any such relationship with the use of other media such as movies, video games or radio, etc. But the study did find that every extra hour of television meant an eight percent increase in the chances of developing signs of depression. Young men were more likely than young women to develop depression given the same amount of media use.

The study didn’t explore if watching TV causes depression. But one possibility is that it was taking time away from activities that could help prevent depression.

Last December, the journal Social Indicators Research published a study of activities that help lead to happy lives. Sociologists from the University of Maryland found that people who describe themselves as happy spend less time watching television than unhappy people. The study found that happy people are more likely to be socially active, to read, to attend religious services and to vote.

1.We can learn from the survey that of all the media use ___________________.

A. computer games are teenagers’ favorite

B. most teenagers prefer to listen to the radio

C. teenagers enjoy watching TV very much

D. newspaper is not included in the survey

2.According to the passage, what kind of activity may help prevent depression?

A. Taking part in sports.　　 B. Playing computer games.

C. Listening to the radio.　　 D. Watching movies.

3.We can conclude that a teenager should ____________.

A. play more video games instead of watching TV

B. attend religious services and care for politics

C. be more active in reading and studying

D. be active in taking part in outdoor activities

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. Experts have warned ______ of the health risks caused by passive smoking.

A. at a time           B. at one time       C. for some time   D. for the time

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Animal experts in Croatia say a bear has learned how to trick people to let him in by knocking at the door.

They believe the 220- kilogram brown bear probably learned the trick while nudging (轻推) a door to get it to open.

Experts have a guess that the nudging was mistaken by the owners for knocking and that the bear, pleased by the result, repeated the trick.

The Loknar family from Gerovo in western Croatia said the bear had knocked at their door three times and they were now refusing to answer the door.

‘‘We jumped out of the window as he came in through the door and went into the kitchen to take some food for the first time.” Mum Nevenka Loknar told a reporter from a local newspaper. “I opened the door and saw him standing there and I didn’t believe my eyes at first, then I ran for it as he walked in as if it was the most normal- thing in the world.”

Bears are a common thing in the woods around here, but no one has ever heard of a bear that knocks at the door.

Mum Nevenka Loknar said, “The bear is so intelligent. It’s incredible. We’ve tried to put up lots of obstacles to stop him coming in, like a wire fence but he still gets through. I wouldn’t be surprised if he knew how to use wire cutters.”

1.According to experts in Croatia, how did the bear learn the trick?

A．By knocking at the door several times.       B．By accident.

C．By learning from the owner of a family.       D．By imitation.

2.What does the underlined word “it” in paragraph 5 refers to?

A．Eating at the kitchen.                     B．Knocking at the door.

C．Walking into the house.                   D．Answering the door.

3.It is ________ in Gerovo that a bear knocks at the door.

A．unusual           B．a troubling problem  C．common          D．an exciting experience

4.Mum Nevenka Loknar was surprised that the bear ________.

A．didn’t attack her family

B．knew how to use wire cutters

C．jumped across her wire fence three times

D．was clever at getting through the obstacles

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It is known to us that computer users are being warned by industry experts to pay attention to secret codes which could be used to record their conversation.

E-mails, screen savers, and electronic greeting cards can carry a secret code which is able to turn on the computer’s microphone, make a recording, and forward it to someone else without the user’s knowledge.

In fact any attachments (附件) sent to a computer, whether it is a game of Space Invaders, or a moving picture, can possibly be used to spy (窥探).

Experts say people should always think twice about opening attachments because --- although not common --- bugging (窃听) by computer can and has been done.

Bill Lyons, head of the Internet Security Company Finjan, said, “People in the army have tested this and you can be sure, if people in general are aware of it, then computer hackers (黑客) are aware of it. The frightening thing is that there are tools on the Internet which people, using a simple search method, can find, and which will enable them to attach this dangerous code to simple attachments.”

1.What is the advice given in the passage?

A. Use secret codes to record other people’s conversation.

B. Be careful when opening an attachment.

C. Never open any attachments.

D. Never use secret codes.

2.What worries the experts is that ___ .

A. nobody seems to believe such things

B. nobody knows the danger of the code

C. tools can easily be used to tie dangerous codes to e-mails

D. effective ways can never be found to deal with the problem.

3.Which of the following is TRUE according to the passage?

A. A moving picture cannot be used to spy.

B. Electronic greeting cards cannot carry a secret code.

C. A secret code is used to destroy the computer system.

D. Any attachments sent to a computer may carry a secret code.

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