题目
题型：海南省期中题难度：来源：
these searches have been done over the radio. The hope is that someone in outer space may be trying to
get in touch with us. Scientists also have sent radio and television messages on spaceships traveling
through space, on the chance that someone may be receptive (善于接受的) to such messages.
Scientists are using powerful radio telescope to listen to signals from about 1,000 stars, all within 100
light years of earth. In addition, they will scan (扫视) the entire sky to "listen" for radio messages from
more distant stars. Using a computer, they will be able to monitor more than eight channels at one time.
Scientists are looking for any signal that stands out from the background noise.
Of the 200 billion stars in the Milky Way galaxy (银河星系), scientists find that five percent are like
our sun. Perhaps half of them have a planet like earth. Such a planet would be a reasonable distance from
the star for temperatures to be right for the evolution of life. Based on the inhabitable (that can be lived in) planets in our galaxy, most scientists agree that chances are likely that one or more of these planets
support some life.
However, many scientists wonder whether intelligent (有智力的) life exists on other planets. Some
believe that twenty years of searching without any intelligible (可理解的) messages shows that no one is
out there. They say that the evolution of intelligence comparable to ours is unlikely.
Other scientists believe that our search hasn"t been long enough to rule out the possibility that intelligent
life exists in our galaxy. Although our sun family in only about five billion years old, our galaxy is about 20
billions years old. In that time, some scientists think it is likely that civilizations are much more advanced
than ours. Perhaps these civilizations (文明) send us no signals; perhaps we have not recognized the
signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep
looking.
B. 10 billion
C. 15 billion
D. 200 billion
B. why scientists are looking for signs of life on other planets
C. where scientists are looking for signs of life on other planets
D. when scientists are looking for signs of life on other planets
B. follow
C. check
D. form
B. Most scientists believe that there is intelligent life on other planet.
C. Scientists are trying different ways to find signs of life on other planet.
D. Scientists don"t believe that there might be life on other planets.
答案
核心考点
试题【阅读理解。 For more than twenty years scientists have been searching for signs of】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
a world filled with smart robots, which will be helping you to take care of your children, or your elderly
parents in your home. You"ll live much longer thanks to the medicine made by genetic (基因的) science.
And mankind may be going farther in space than ever before-you will be living on the moon or Mars.
How should we view the changes that wait for us in the future? Should we be optimistic about the years
ahead, or worried about what the future holds? Some scientists and experts are having a discussion about how technology, science and society will develop in the future.
"I"m looking forward to the day when more technology will come to my life," says John Searle, a
professor at the University of California Berkeley Philosophy, "because I think further research in such
areas as genetics, physics, chemistry and medicine will help us to overcome poverty, improve health,
and make life longer."
Hugh Herr, at MIT"s Biomechatronics Group, considers very powerful weapons as concern over
the future. Another is the growing role of technology in our lives."Machines taking over what humans
do is not a good thing," Herr says.
That is a similar concern shared by Daniela Cerqui, a social and cultural scientist. "I am afraid
that the long-term future we are building will have no space left for human beings," says Cerqui. "The
main values of our society are related to information that must progress as quickly as possible, and
computers are much better than humans in these tasks ."
B. how people will live in a modern society
C. what life would be like in the future
D. what computers will bring to our society
B. Optimistic.
C. Uncertain.
D. Disappointed.
B. machines taking over what humans do
C. the technology of weapons
D. the health problem of humans
B. Great changes will take place in the future
C. The relationship between technology and humans
D. The role of robots and computers in the future
live perfectly well. But some fish put us to shame. They can get by without stomachs.
One such fish is the stout longtom. The group it belongs to carries a more appropriate name: the
needlefish. All needlefish lack stomachs. Their ancestors had them, but later they were lost.
The stout longtom can reach 1.3 meters in length, and lives near the sea surface. Like all needlefish, it
can jump out of the water to escape its enemies. Tropical fishermen are sometimes injured by needlefish.
In 1977, a 10-year-old Hawaiian boy was killed when a needlefish jumped through his brain. The
longtom eats smaller fish. It teeth are not good at cutting fish into pieces, so it swallows fish whole.
Ryan Day from Australia and his colleagues wanted to know how the longtom digests its meaty meals without a stomach, so they ran some chemical tests about the fish.
Day"s results show that the longtom can consume food without the help of a stomach. It uses a special material called trypsin that can break down proteins without acid - although the approach is less efficient
than using a stomach.
Because it"s a meat-eating animal, the longtom gets a lot of protein in its food, so it can afford this
slightly less efficient system for absorbing it. Two plant-eating fish that Day studies actually had higher
levels of trypsin in their body, as their food was low in protein.
Day thinks that the longtom and its stomachless relatives might actually have arrived at an
energy-saving solution. He says that although the stomach is critical to many kinds of animal, the organ is
"a fairly expensive organ to run". This perhaps explains why some animals have got rid of theirs.
B. Fight.
C. Hunt.
D. Live.
B. digests the smaller fish in its body
C. can jump so high to escape its enemies
D. uses acid to break down the protein
B. Acid
C. The stomach.
D. Protein in its body.
B. the longtom often waste energy
C. the longtom"s high-protein food helps its unique way of consuming food.
D. meat -eating fish have higher levels of trypsin in their bodies than plant-eating fish
resting time.
However, another study shows that sitting in front of computer or TV screens for long hours is not the
only reason for myopia (近视). An Australian research team studied young children in Sydney and
Singapore to find the reasons for myopia.
The research team found that the prevalence (流行) of myopia among children in Sydney was lower
than children in Singapore, even though they spent more time in front of computer and TV screens. The
major finding is that children in Sydney spend longer hours on outdoor activities than those in Singapore.
Indoor and outdoor sports activities both make the eyes focus on more distant objects, which prevents
the eyes from changing shape. But outdoor activities may better help avoid myopia than indoor sports
activities.
Jane Gwiazda, who does research in sight problems, says: "Natural light is good for eye growth. And
extra vitamin D from the sun might contribute to eye growth."
Many doctors suggest that every child get its first eye test done when he/she is about two and half
years old, and even if his/her sight seems perfect.
It is necessary for myopic children to wear glasses to prevent headaches, trouble reading or injuries. It
is also important that schools invite doctors to test their students" eyes.
If that is not possible, school teachers should at least encourage parents and children to have regular
eye examinations and wear glasses. And parents should remember not only to limit the total screen time
for their children, but also to encourage them to spend time outdoors.
B. To find the ways to treat myopia.
C. To prove the bad effects of myopia.
D. To prove the prevalence of myopia.
B. Because Sydney children have more eye resting time.
C. Because Sydney children use computers less.
D. Because Sydney children do more outdoor sports.
B. Singapore children do few exercises.
C. Outdoor activities do more good to eyes.
D. Room light does harm to children"s eyes.
B. Doing outdoor activities with no glasses is good for myopia children.
C. Focusing on distant objects can help the eyes keep their original shape.
D. Children should limit their time in the sun in order to protect their eyes.
future?
The news that a human embryo (胚胎) has been 1 cloned for the first time has caused mixed reactions(反应).
The 2 was carried out by scientists from the Advanced Cell Technology Inc(ACT),in Massachusetts,US. The group 3 the news on November 25.
This is not a cloned human being. "A 4 is alive,it walks,it breathes,"said Jamie Grifo,an expert on the study of cloning at New York University School of Medicine.
"This is a set of cells in a lab that will be used to 5 someone"s life."
Such research could lead to treatment for 6 such as heart disease,AIDS and even cancer, 7
scientists.
Despite high hopes from other scientists,the news 8 concerns immediately from religious and political
leaders. Several 9 in the US do not allow human cloning. President George W.Bush also made it clear
that he is 10 any type of human cloning. However, the 11 at ACT said they have no interest at present
in developing an early embryo into 12 .
Animals have been cloned repeatedly since Dolly,the sheep, 13 in 1997.And there were no real
technical 14 to stand in the way of scientists making a cloned human embryo.
This time the research group used traditional cloning technology with a human 15 . 16 it was given
DNA from an adult cell,the egg began to 17 . 18 it was stopped from becoming a baby-at a stage in
which it was 19 a ball of cells. The 20 technology has been used to clone sheep,cattle and monkeys.
| ( )1. A. in failure ( )2. A. research ( )3. A. made known ( )4. A. cell ( )5. A. save ( )6. A. patients ( )7. A. according to ( )8. A. beat ( )9. A. countries ( )10. A. for ( )11. A. scientists ( )12. A. a baby ( )13. A. lived ( )14. A. questions ( )15. A. egg ( )16. A. Before ( )17. A. grow ( )18. A. And ( )19. A. yet ( )20. A. different | B. never B. report B. made B. person B. kill B. health B. including B. lost B. nations B. against B. president B. a man B. appeared B. affairs B. bless B. After B. die B. But B. still B. usual | C. successfully C. works C. said C. man C. cure C. diseases C. besides C. raised C. peoples C. researching for C. people C. a woman C. turned C. business C. meat C. While C. change C. However C. not C. ordinary | D. not D. task D. had D. clone (克隆人) D. treat D. things D. argued D. missed D. states D. praising D. research D. a white man D. was no more D. problems D. cell D. And D. appear D. Yet D./ D.same |
| 阅读理解。 | |||
| We know that many animals do not stay in one place. Bird, fish and other animals move from one place to another at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowded. When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration (迁移) is probably the migration of the fish, which is called "salmon". This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies there. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea. Recently, scientists have studied the migration of a kind of lobster (龙虾). Every year, when the season of bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where they go. So, sometimes we know why humans and animals move from one place to another, but at other times we don"t. Maybe living things just like to travel. | |||
| 1. Most animals move from one place to another at a certain time to _________. | |||
| A. give birth B. enjoy warmer weather C. find food more easily D. find beautiful places | |||
| 2. The fish called "salmon" spends a long life in _________. | |||
| A. salt water B. rivers C. fresh water D. its birthplace | |||
| 3. What is the main idea of the passage? | |||
| A. Animals move in order to find food more easily. B. The migration of the fish called "salmon" is the most famous migration. C. Living things move from one place to another because they like to travel. D. sometimes we know why and how living things move from one place to another, but sometimes we don"t. |