题目
题型:同步题难度:来源:
Researchers from the University of Iowa based their findings on a review of 18 earlier studies that
looked at the association between sunscreen use and melanoma (黑素瘤). They said that they found flaws in studies that had reported associations between sunscreen use and higher risk of melanoma.
Most health experts believe that by protecting the skin from the harmful effects of the sun, sunscreen
helps prevent skin cancer, which is increasing in incidence (发生率) faster than any other cancer in the
United States.
But questions has been raised about sunscreen and whether it may has opposite effect, perhaps by
allowing people to remain exposed to the sun longer without burning.
The researchers said that among the problems with some earlier studies is that they often failed to
take into account that those people most at risk for skin cancer-people with fair skin(白皙的肤色) and
freckles (雀斑), for example-are more likely to use sunscreen. As a result, it may appear that sunscreen
users get cancer more often.
The studies, which generally relied on volunteers to recall their sunscreen use, were also unable to
prove how well the products had been applied, said the new study.
B. facts
C. faults
D. failures
B. are more in danger of skin cancer
C. can be free from the harm of the sun
D. often expose themselves to the sun
B. the volunteers have proved the effect of sunscreen
C. the new study was based on the experiences of volunteers
D. the number of skin cancer patients is increasing in America
B. Sunscreen to Increase Skin Cancer
C. Skin Cancer Caused by Sunscreen
D. Skin Cancer Caused by Freckles
答案
核心考点
试题【阅读理解 A new study has found no evidence that sunscreen, commonly used to re】;主要考察你对社会现象类等知识点的理解。[详细]
举一反三
can spend ten fen on this short message, sending you my best wishes!"
Today, SMS-Short Message Service is popular, and China Mobile says that every second, there are
410 messages being sent.
Look around you! People are watching their mobiles, smiling or laughing. Thumbs are moving quickly
on mobiles, bringing happiness to their friends. Through SMS, we know the weather report, share jokes
and news, express love and friendship.
SMS is becoming more and more popular. It is reported that 67% of young people like to send short
messages to greet each other. Internet SMS will be more helpful to people. I am thankful for the progress
because SMS saves me much money. Just on the top end of a thumb, so much joy can be found!
__________________________________
__________________________________
__________________________________
__________________________________
changes will take place, but what will the changes be?
The population is growing fast. There will be many people in the world and most of them will live
longer than people live now.
Computers will be much smaller and more useful, and there will be at least one in every home.
And computer studies will be one of the important subjects in schools then.
People will work fewer hours than they do now and they will have more free time for sports,
watching TV and travelling. Travelling will be much easier and cheaper. And many more people will
go to other countries for holidays.
There will be changes in our food, too. Maybe no one will eat meat every day, instead they eat
more fruit and vegetables. Maybe people will be healthier.
Work in the future will be different, too. Dangerous and hard work can be done by robots.
Because of this, many people will not have enough work to do. This will be a problem.
B. few changes
C. more people
D. few people
B. much smaller and more useful
C. smaller and not many people will use it
D. bigger and a lot of people will use it
B. will study at school
C. will go earlier
D. will work for many hours
B. meat; fruit and vegetables
C. fruit and meat; vegetables
D. meat and vegetables; fruit
B. do all the work
C. do only housework
D. do the easy work for people
and crossing the road is not safe. These bridges can help people cross roads 2.s .Overhead bridges
are used in very much the same way as zebra crossings(斑马线).They are more efficient(效率高的),
3.t less convenient(方便的)because people have to climb up a lot of steps. This is inconvenient to
the old. When people 4.u an overhead bridge, they do not hold up(阻挡) traffic. But when they
cross a busy road using a zebra crossing, traffic is held up. This is 5.w the government(政府)has
built many overhead bridges to help people and 6.k traffic moving at the same time. The government
of Singapore has 7.s a lot of money building these bridges. For their own safety, people should be
advised to use them instead of rushing across the road. Old people may find it a little 8.d climbing up
and down the steps, but it is still much safer than walking across the road 9.w all the moving traffic.
Overhead bridges are very useful. People, both old and young, should always use them. This will stop
accidents from 10.h .
Hundreds of years ago, life was much harder than it is today. People didn"t have modern machines.
There was no modern medicine, either.
Life today has brought new problems. One of the biggest is pollution (污染). Water pollution has
made our rivers and lakes dirty. It kills our fish and polluted our drinking water. Noise pollution makes
us talk louder and become angry more easily. Air pollution is the most serious kind of pollution. It"s
bad to all living things in the world.
Cars, planes and factories all pollute our air every day. Sometimes the polluted air is so thick that
it is like a quilt over a city. This kind of quilt is called smog(烟雾).
Many countries are making rules to fight pollution. Factories must now clean their water before it
is thrown away, they mustn"t blow dirty smoke into the air.
We need to do many other things. We can put waste things in the dustbin and not throw it on the
ground. We can go to work by bus or with our friends in the same car. If there are fewer people driving,
there will be less pollution.
Rules are not enough. Every person must help to fight pollution.
B. there was no modern medicine
C. both A and B
D. there were not many people
B. Air pollution
C. Noise
D. Pollution
B. air pollution
C. water pollution
D. A, B and C
B. when they are thrown away
C. after it is thrown away
D. before it is thrown away
B. today people don"t have to talk to each other in a loud voice
C. we can drink water from the polluted rivers and lakes"
D. people are making rules in order to fight pollution
a______2 the first thing to do in the morning, others read newspapers as soon as they are free during the day so
that they can learn what is h______3 in the world.
Sometimes, however, we do not have e______4 time to read all the news carefully, so we just take a quick look
at the front page, at other times, we may be in such a h______5 that we only have a few minutes to look at the
names of the passages.
Newspapers can be found everywhere in the world. We can get many different kinds of newspapers in the big
cities, of course, but in some of the mountain v______6 we can see few newspapers.
Some newspapers are published o______7 a week, but most of the newspapers are published once a day with
many pages, some even published twice a day! As you know different people e______8 reading different
newspapers, some like sports news, some like economic news and others prefer short stories. They just choose
what they are i______ 9 in.
Today newspapers in English have the l______ 10 number of readers in the world.
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