回答（49）题 查看材料A.Scholars differ in interpreting th

回答（48）题 查看材料

A.Scholars differ in interpreting the purpose of the designs.

B.The largest picture may have been the sites for special ceremonies.

C.He called Nazca "the largest astronomy book in the world".

D.A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.

E.Other scientists are now searching for evidence to prove this.

F.Seen from the ground， it looks like lines scratched into the earth.

回答（47）题 查看材料

A.Scholars differ in interpreting the purpose of the designs.

B.The largest picture may have been the sites for special ceremonies.

C.He called Nazca "the largest astronomy book in the world".

D.A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.

E.Other scientists are now searching for evidence to prove this.

F.Seen from the ground， it looks like lines scratched into the earth.

根据以下材料，回答题

The Mysteries of Nazca

In the desert of Peru， 300 kilometers from Lima， one of the most unusual artworks in the world has mystified （迷惑） people for decades. 46______ But from high above， these marks are huge images of birds， fish， seashells， all beautifully carved into the earth.

The Nazca lines are so difficult to see from the ground that they weren"t discovered until the 1930s， when pilots spotted them while flying over the area. In all， there are about 70 different human and animal figures on the plain， along with 900 triangles， circles， and lines.

Researchers have figured out that the lines are at least 1，500 years old， but their purpose is still a mystery.47______ However， it would probably be very tricky to land a spaceship in the middle of pictures of dogs and monkeys.

In the 1940s， an American explorer named Paul Kosok suggested that the drawings are a chronicle （记录） of the movement of the stars and planets.48______ Later， an astronomer tested his theory with a computer， but he couldn"t find any relation between the lines and movements in space.

Another explanation is that the lines may have been made for religious reasons. British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road. It"s possible that in the past， the lines of Nazca were created for a similar purpose.49______ But the local people have never constructed anything this big.

Recently， two other scientists， David Johnson and Steve Mabee， have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area， he noticed that some waterways built by ancient people were connected with the lines. Johnson believes that the Nazca lines are a giant map of the underground water in the area. 50______

回答（46）题 查看材料

A.Scholars differ in interpreting the purpose of the designs.

B.The largest picture may have been the sites for special ceremonies.

C.He called Nazca "the largest astronomy book in the world".

D.A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.

E.Other scientists are now searching for evidence to prove this.

F.Seen from the ground， it looks like lines scratched into the earth.

料

A.Larry Althouse

B.Althouse"s grandfather

C.Liesl"s mother

D.Ashley Batista

根据以下材料，回答题

More Than a Ride to School

The National Education Association claims "The school bus is a mirror Of the community."

They further add that， unfortunately， what appears on the exterior（外部）does not always reflect the reality of a chosen community. They are right， and sometimes it reflects more! Just ask Liesl Denson. Riding the school bus has been more than a ride to school for Liesl.

Bruce Hardy， school bus driver for Althouse Bus Company has been Liesl"s bus driver since kindergarten. Last year when Liesl"s family moved to Parkesburg， knowing her bus went by her new residence， she requested to ride the same bus.

This year Liesl is a senior and will enjoy her last year tiding the bus. She says， "It"s been a great tide so far! My bus driver is so cool and has always been a good friend and a good listener.

Sometimes when you"re a child， adults do not think that what you have to say is important. Mr.

Hardy always listens to what you have to say and makes you feel important." Her friends Ashley Batista and Amanda Wolfc agree.

Brace Hardy has been making Octorara students feel special since 1975. This year he will celebrate 30 years working for Althouse Bus Transportation. Company President Larry Althouse acknowledges Bruce Hardy"s outstanding record. "You do not come by employees like Bruce these days: he has never missed a day of work and has a perfect driving record. Recognized in 2000 by the Pennsylvania School Bus Association for driving 350，000 accident free miles， Hardy"s reputation is made further evident through the relationships he has made with the students that ride

his bus. "

Althouse further added. "Althouse Bus Transportation was established 70 years ago and has been providing quality transportation ever since my grandfather started the business with one bus.

Althouse Bus Transportation is delighted to have the opportunity to bring distinctive and safe service to our local school and community and looks forward to continuing to provide quality service for many more years to come."

Three generations of business is not all the company has enjoyed. Thanks to divers like Bruce Hardy， they have been building relationships through generations. Liesl"s mother Carol also enjoys fond memories of riding Bruce Hardy"s bus to the Octorara School District.

The word "mirror"in the first line could be best replaced by__________. 查看材料

A."vehicle"

B."device"

C."need"

D."reflection"

根据以下材料，回答题

Eat to Live

A meager diet may give you health and long life， but it"s not much fun —— and it might not even be necessary. We may be able to hang on to most of that youthful vigor even if we don"t start to diet until old age.

Stephen Spindler and his colleagues from the University of California at Riverside have found that some of an elderly mouse"s liver genes can he made to behave as they did when the mouse was young simply by limiting its food for four weeks. The genetic rejuvenation won"t reverse other damage caused by time for the mouse， but could help its liver metabolize drugs or get rid of toxins.

Spindlers team fed three mice a normal diet for their whole lives， and fed another three on half-rations. Three more mice were switched from the normal diet to half-feed3 for a month when they were 34 months old —— equivalent to about 70 human years.

The researchers checked the activity of 11，000 genes from the mouse livers， and found that 46 changed with age in the normally fed mice. The changes were associated with things like inflammation and free radical production—— probably bad news for mouse health. In the mice that had dieted nil their lives， 27 of those 46 genes continued to behave like young genes. But the most surprising finding was that the mice that only started dieting in old age also benefited from 70 per cent of these gene changes.

"This is the first indication that these effects kick in pretty quickly." say Huber Warner from the National Institute on Aging near Washington D. C.

No one yet knows if calorie restriction works in people as it does in mice， but Spindler is hopeful. "There"s attracting and tempting evidence out there that it will work，" he says.

If it does work in people， there might be good reasons for rejuvenating the liver. As we get older， our bodies are less efficient at metabolizing drugs， for example. A brief period of time of dieting， says Spindler， could be enough to make sure a drug is effective.

But Spindler isn"t sure the trade-off is worth it6. "The mice get less disease， they live longer，but they"re hungry，" he says， "Even seeing what a diet does， it"s still hard to go to a restaurant and say: "I can only cat half of that"." Spindler hopes we soon won"t need to diet at all. His company，Lifespan Genetics in California， is looking for drugs that have the effects of caloric restriction.

According to the passage， which of the following is NOT true? 查看材料

A.Eating less than usual might make us live longer.

B.we go on a diet when old， we may keep healthy.

C.Dieting might not be needed.

D.We have to begin dieting since childhood.

根据以下材料，回答题

Spacing in Animals

Flight Distance

Any observant person has noticed that a wild animal will allow a man or other potential enemy to approach only up to a given distance before it flees. "Flight distance" is the terms used for this interspecies spacing. As a general rule， there is a positive relationship between the size of an animal and its flight distance- the larger the animal， the greater the distance it must keep between itself and the enemy. An antelope will flee when the enemy is as much as five hundred yards away. The wall lizard"s flight distance， on the other hand is about six feet. Flight is the basic means of survival for mobile creatures.

Critical Distance

Critical distance apparently is present wherever and whenever there is a flight reaction.

"Critical distance" includes the narrow zone separating flight distance from attack distance. A lion in a zoo will flee from an approaching man until it meets a barrier that it cannot overcome. If the man continues the approach， he soon penetrates the lion"s critical distance， at which point the cornered lion reverses direction and begins slowly to stalk the man.

Social Distance

Social animals need to stay in touch with each other. Loss of contact with the group can be fatal for a variety of reasons including exposure to enemies. Social distance is not simply the distance at which an animal will lose contact with his group——that is， the distance at which it can no longer see， hear， or smell the group——it is rather a psychological distance， one at which the animal apparently begins to feel anxious when he exceeds its limits. We can think of it as a hidden band that contains the group.

Social distance varies from species to species. It ~is quite short- apparently only a few yards——among some animals， and quite long among others.

Social distance is not always rigidly fixed but is determined in part by the situation. When the young of apes and humans are mobile but not yet under control of the mother"s voice， social distance may be the length of her reach. This is readily observed among the baboons in a zoo.

When the baby approaches a certain point， the mother reaches out to seize the end of its tail and pull it back to her. When added control is needed because of danger， social distance shrinks. To show this in man， one has only to watch a family with a number of small children holding hands as they cross a busy street.

Which of the following is the most appropriate definition of Flight Distance? 查看材料

A.Distance between animals of the same species before fleeing.

B.Distance between large and small animals before fleeing.

C.Distance between an animal and its enemy before fleeing.

D.Distance between certain animal species before fleeing.

The United States will introduce __________. 查看材料

A.the nucleus of a cell

B.cloned human beings

C.a human being in two years

D.a law to ban human cloning

E.a report on human cloning

F.heavy media coverage

料

A.the nucleus of a cell

B.cloned human beings

C.a human being in two years

D.a law to ban human cloning

E.a report on human cloning

F.heavy media coverage

看材料

A.the nucleus of a cell

B.cloned human beings

C.a human being in two years

D.a law to ban human cloning

E.a report on human cloning

F.heavy media coverage