Flying over a desert in an airplane, two scientists looked down with trained eyes at trees and bushes．After an hour’s flight, one of the scientists wrote in his notebook, "Look here for probable metal." Walking across hilly ground, four scientists reported, "This ground should be searched for metals." From an airplane over a hilly wasteland a scientist sent back by radio one word "Uranium".
None of the scientists had X-ray eyes: they had no magic powers for looking down below the earth’s surface．They were merely putting to use one of the newest methods of locating minerals in the ground -- using trees and plants as signs that certain minerals may lie under the ground on which the trees and plants are growing.
This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow on the surface.
At Watson Bar Creek, a mineral search group gathered bags of tree seeds．Boxes were filled with small branches from the trees．Roots were dug and put into boxes．Each bag and box was carefully marked．In a scientific laboratory the parts of the forest trees were burned to ashes and tested．Each small part was examined to learn whether there were minerals in it.
Study of the roots, branches and seeds showed no silver．But there were small amounts of gold in the roots and a little less gold in the branches and seeds．The seeds growing nearest to the tree trunk had more gold than those growing on the ends of the branches.
If the trees indicated that there was no gold in the ground, the scientists wouldn’t spare money to pay for digging into the ground.
【小题1】Scientists were flying over a desert or a hilly wasteland or a mountain region to _____.

A．train their eyes	B．study the trees
C．look for gold	D．search for minerals

【小题2】The study of trees, branches and roots indicated that ______.

A．there were larger amounts of gold in the branches far from the tree trunk than in the seeds

B．there were smaller amounts of gold in the tree roots deep in the ground than in the branches

C．there were larger amounts of gold in the seeds growing closer to the tree trunk than in the seeds farther from it

D．there were larger amounts of gold in the branches than in the leaves on the ends of the branches

【小题3】Which of the following is NOT mentioned as part of a tree that can help the searchers?

A．leaves

B．roots

C．branches

D．seeds

【小题4】Which of the following might be the best title for this passage?

A．Scientists searching for treasure with special equipment.

B．New methods of doing geological study.

C．Gold could be found in trees and plants.

D．A new method of searching for minerals.

In 2004，the World Health Organization，WHO，warned of a possible outbreak of another serious disease which may be even more deadly than SARS．The WHO believes that it is likely that bird flu will spread to human beings in the next few years．If it does，up to seven millions people could die from the disease．

Diseases like bird flu are caused by viruses，that is，tiny things which change and become more dangerous over time．When a new type of a common virus changes，it may be able to get past the body’s immune(免疫的)system．If that happens，humans are in great danger until a cure or treatment becomes available．

There have always been viruses and people always get sick，of course，but as we saw with SARS，the situation is more difficult today．People travel more than ever before，which means that disease can spread quickly and across large areas——in fact the whole world．

Scientists are already working on drugs that will prevent or limit the effect of a new virus，but the process takes time．It is just as important to make sure that countries，especially poor countries，are prepared to deal with the disease. New disease usually affect poor areas the most，so we must help develop health care in all countries．

1.The situation is more serious today because           ．

A．people travel more                                      B．people don’t eat healthy food

C．there aren’t enough hospitals                        D．scientists can’t find a cure

2.From this passage we know           ．

A．bird flu will surely spread to human beings in the next few years．

B．a virus changes and become less dangerous over time．

C．SARS is 1ikely to come again in some years．

D．poor areas usually suffers more from new diseases than rich areas．

3.The possible title of this passage is

A．The Work of WHO

B．Scientists Are Working Hard on Drugs for Diseases

C．What Is a Virus

D．Virus Changes and Causes New Diseases Over Time

 

In 2004，the World Health Organization，WHO，warned of a possible outbreak of another serious disease which may be even more deadly than SARS．The WHO believes that it is likely that bird flu will spread to human beings in the next few years．If it does，up to seven millions people could die from the disease．

Diseases like bird flu are caused by viruses，that is，tiny things which change and become more dangerous over time．When a new type of a common virus changes，it may be able to get past the body’s immune(免疫的)system．If that happens，humans are in great danger until a cure or treatment becomes available．

There have always been viruses and people always get sick，of course，but as we saw with SARS，the situation is more difficult today．People travel more than ever before，which means that disease can spread quickly and across large areas——in fact the whole world．

Scientists are already working on drugs that will prevent or limit the effect of a new virus，but the process takes time．It is just as important to make sure that countries，especially poor countries，are prepared to deal with the disease. New disease usually affect poor areas the most，so we must help develop health care in all countries．

The situation is more serious today because           ．

A．people travel more                                      B．people don’t eat healthy food

C．there aren’t enough hospitals                        D．scientists can’t find a cure

From this passage we know           ．

A．bird flu will surely spread to human beings in the next few years．

B．a virus changes and become less dangerous over time．

C．SARS is 1ikely to come again in some years．

D．poor areas usually suffers more from new diseases than rich areas．

The possible title of this passage is

A．The Work of WHO

B．Scientists Are Working Hard on Drugs for Diseases

C．What Is a Virus

D．Virus Changes and Causes New Diseases Over Time

In 2004，the World Health Organization，WHO，warned of a possible outbreak of another serious disease which may be even more deadly than SARS．The WHO believes that it is likely that bird flu will spread to human beings in the next few years．If it does，up to seven millions people could die from the disease．

Diseases like bird flu are caused by viruses，that is，tiny things which change and become more dangerous over time．When a new type of a common virus changes，it may be able to get past the body’s immune(免疫的)system．If that happens，humans are in great danger until a cure or treatment becomes available．

There have always been viruses and people always get sick，of course，but as we saw with SARS，the situation is more difficult today．People travel more than ever before，which means that disease can spread quickly and across large areas——in fact the whole world．

Scientists are already working on drugs that will prevent or limit the effect of a new virus，but the process takes time．It is just as important to make sure that countries，especially poor countries，are prepared to deal with the disease. New disease usually affect poor areas the most，so we must help develop health care in all countries．

The situation is more serious today because           ．

A．people travel more                                      B．people don’t eat healthy food

C．there aren’t enough hospitals                        D．scientists can’t find a cure

From this passage we know           ．

A．bird flu will surely spread to human beings in the next few years．

B．a virus changes and become less dangerous over time．

C．SARS is 1ikely to come again in some years．

D．poor areas usually suffers more from new diseases than rich areas．

The possible title of this passage is

A．The Work of WHO

B．Scientists Are Working Hard on Drugs for Diseases

C．What Is a Virus

D．Virus Changes and Causes New Diseases Over Time

Detectives often look for footprints when they try to solve crimes. Scientists use footprints, too—dinosaur footprints when they try to figure out how dinosaurs lived and moved.

Dinosaurs died out about 65 million years ago. Today scientists work to solve the mysteries of these ancient animals.

Footprints, or tracks(脚印), are an important way to learn about dinosaurs. Christian Meyer of the Natural History Museum in Basel, Switzerland, calls dinosaur tracks “the closest thing to a movie” of dinosaurs.

“They tell us something about the size of the animal, the way they were walking…they tell us something about their speed,” Meyer said.

Tracks also show that dinosaurs sometimes traveled in groups. Traveling in groups probably helped dinosaurs protect themselves from enemies. Plus, some meat-eating dinosaurs may have hunted in groups, much like wolves do today. Being in a group could help dinosaurs work together to kill large animals.

Dinosaur footprints can be as small as a few inches across, but they can also be as big as a few feet across. Dinosaur footprints have been found throughout the world at over 1,500 sites, including a T. Rex footprint in New Mexico. “Trackways” are groups of footprints.

And scientists aren’t the only ones finding dinosaur tracks—kids can, too! Eleven-year-old Mark Turner and nine-year-old Daniel Helm discovered dinosaur tracks in British Columbia, anada. Soon scientists began studying the tracks.

Scientists and other people interested in studying dinosaurs are working to save the trackways from activities like construction and mining.

The passage mainly tells us that_______.

there were really dinosaurs on the earth millions of years ago

dinosaurs were the most frightening animals in the past

C. dinosaur footprints are important in learning about dinosaurs

why dinosaurs died out millions of years ago

By studying footprints scientists can know the following EXCEPT _______.

A. how big the dinosaur was             B. what color the dinosaur was

C. how fast the dinosaur could run        D. how the dinosaur walked

By working in groups, some meat-eating dinosaurs_______.

   A. made the hunting of large animals easily

   B. could travel a long way without being lost

   C. could protect themselves from being hunted by wolves

   D. could get to a place faster

From the last paragraph we can infer that some human activities like mining_______.

   A. are helpful to the study of dinosaurs

   B. can help scientists solve many mysteries

   C. can lead to the discovery of the footprints

   D. can destroy the footprints of the dinosaur