Is ______ three hours ______ the boy ______ family is poor to come to school on foot？ A) it; that;

A、three quarters of an hour time

B、three quarter's of an hour time

C、three quarters of an hour's time

D、three quarters'of an hour's time

A.three quarters of an hour time

B.three quarter of an hour time

C.three quarters of an hour's time

D.three quarter of an hour's time

A．ahead one hour in each new time zone

B．ahead by twentythree hours

C．back one full day for each time zone

D．ahead one hour for the whole trip

A．every hour

B．every half hour

C．every two hours

D．every three hours

ks with "for" or "since

1.()half an hour

2.()last year

3.()noon

4.()one month

5.() yesterday

6.()three days

7.()I started the job

8.()decades

听力原文：W: If we hurry we can take the express train and save an hour, couldn’t we M: Yes. The express takes only three hours to get to New York. Q: How long does it take the local train to get to New York （）

A．One hour．

B．Two hours．

C．Three hours．

D．Four hours．

Text Three

A.lights

B.protect

C. in the dark

Phrases:

A.sit at home 70_________

B.turn off all non-essential 71_________

C.passed a law to 72_________the sea

I’m a big fan of trying to save the environment, and this month is the WWF (World Wide Fund for Nature) annual Earth Hour. Earth Hour is an event where you 73_________ and power between 8-9 pm, things like your TV and computer. However, you don’t just 74_________ for an hour. Instead, people gather in groups and have fun without using power. Things like dancing, fireworks and musical performances are popular and it’s very fun to take part. Earth Hour isn’t just about saving energy; people involved in Earth Hour have also planted a forest in Uganda, built 75_________

70、_________

71_________

_72________

75_________ ？

73_________

74_________

请帮忙给出每个问题的正确答案和分析，谢谢！

e.When we set off, we were told it was “more than 30 li” away.One hour later, it was “more than 20 li”, which seemed about right.The pace at which we were walking was not very fast.But the distance remained “more than 20 li” for the next three hours.Finally we came to the main road where there was a kilometre marker by the roadside.Now for sure we would find out exactly how far was left.The marker read “12 km”.In other words, more than 20 li.

fer a heart attack. They say the risk of a heart attack is greatest within an hour of being in traffiC.

The findings are based on a German study of almost 700 people who suffered heart attacks. The patients described their activities during the four days before their heart attack. Researchers found that those who had been in traffic were three times more likely to have a heart attack within one hour, compared to those who had not been in traffiC. Most of those in the study had been traveling by car. But some had been on bicycles and others were on buses.

Research shows that people in cars and buses are exposed to ten times the amount of pollutants as people walking on the street. That is largely because they breathe in the particles and gasses released from the vehicles in front of them.

Over time, these small particles speed the buildup of a sticky substance in the blooD. This can cause blockages(阻塞) to form. in the arteries(动脉) around the heart and lead to a heart attack.

Other studies have also linked heart trouble to stress, similar to the kind that people face while driving in heavy traffiC. But the researchers of the latest study say they do not know whether the increased heart attack risk was the result of stress or pollution. They suggest it may be a combination of stress, noise and pollution. Experts say the research shows the need fro cleaner vehicles and better city planning.

9.According to the study, which of the following ways is the safest in traffic？

A. Driving a car

B. Walking on the street

C. Taking a bus

D. Riding a bicycle

9.From among the 700 people who suffered heart attacks we learn that ______.

A. those who have been in traffic are three times as many as those who have not

B. those who have been in traffic for more than one hour are most likely to suffer heart attacks

C. the risk of a heart attack is three higher among those who have been in traffic than those who have not

D. Most of the subjects (实验对象) felt uncomfortable during the four days before the attack

9.The particles released from vehicles ______.

A. build up in the blood

B. become blockages in the arteries

C. make the blood more sticky

D. do harm to the heart

9.According to the studies, which of the following is NOT a likely cause of heart attack？

A. Stress

B. Noise

C. Air pollution

D. Traffic accident

9.What suggestion do experts make to lower the risk？

A. Reducing traffic as much as possible.

B. Living away from nose.

C. Planting more trees in the city.

D. Making vehicles clean.

ings, watch the larger-than-life play on the 4th floor, and travel to other worlds, to far away stars, on the 5th floor.

Don' t just look. You are expected to feel, to turn, to push. Build your own house and earn why t stands or falls. Use computers to work out plans just as famous scientists have done. There s always something new to learn at the Maryland Science Center.

Children and group visitors enjoy half price.

The excitement of the Maryland Science Center does not end when you leave. Visit the Science Store for a gift you' d like to keep. Electronic jewelry(电子珠宝), games, books, and more — take part of the Science Center home with you.

Information

Where to call:

24 hour general(常规的) information(410)685-5225

24 hour STARLINE night, sky information (410)S39-STAR

Group visitor information (410) 685-2370

Hours:

The Maryland Science Center is open 7 days a week(except Thanksgiving Day and Christmas

Day)

Monday-Friday 10 a. m.-p. m

Saturday and Sunday 10a.m.-p.m.

Whacan visitors do at the Maryland Science Center？

A．Learn science by trying it out.

B．Watch and take part in a play.

C．Make gifts for their friends.