题目
题型：同步题难度：来源：
Washington, the USA. He said that they looked like saucers. Newspapers printed
his story under the headline" Flying Saucers".
Since then, all over the world, people have reported similar strange flying objects.
No one knows what they are or where they come from. Some people say that they
do not exist, but many others say that they have seen them. Usually people on the
ground have seen them but not always. Airline pilots also have reported seeing them
and so have astronauts-the men who fly in spaceships.
Perhaps some people saw them only in their imagination or illusion(幻觉). Perhaps
some people made a mistake. But airline pilots and astronauts do not usually make
mistakes of this kind. Captain Ed Mitchell, the sixth man to walk on the moon, said in
1974 that he believed that some" flying sancers (飞碟) " were real. Many other people
now believe that these strange flying objects are visiting the earth from other worlds in
space. "They have come to greet us," they say.
The American government tried to find out more about these objects. It listened to
a great many people who said they had seen them. But the Govemment Committee
could not decide on what the objects were.It called them UFO, which is short for
"unidentified flying object".
Some even say they have seen people in the flying Saucers!In 1964,a driver of a
police car in new Mexico saw a UFO landing a mile away. When he reached it, there
were two small figures standing near it. They looked like little men. When he reported
on his radio, they got inside the object and flew away.
In 1973 two men were out fishing in Mississippi River. They say they saw a UFO
shaped like an egg. There were three creatures like men but their skins were silver in
colour. They had no eyes, and their mouths were just slits(裂缝) . Their noses and ears
were pointed(尖的).They made the fishermen get inside the UFO for a while. Then the
creatures photographed them and took them to the place where they had been fishing.
There are many other similar stories. Some are probably untrue but some may be
true. No one knows.
B. all officials in Washington
C. an editor of a newspaper
D. the man who flies in saucers
B. know where the objects come from
C.learn more about UFOs
D. report more about UFOs
B. how to observe UFOs
C. the danger of UFOs
D. what we know about UFOs
B. believes that UFOs are real objects flying in the sky
C.is not sure whether there are UFOs or not
D.thinks that these UFOs come from other planets
答案
核心考点
试题【阅读理解。 In 1947 a pilot of a small aeroplane saw rune strange objects in the s】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
earth. Most of it will miss our planet, but two pieces will probably hit the southern half
of the earth.
On 17 July, a piece four kilometers wide enters the earth"s atmosphere(大气层) with a
massive explosion. About half of the piece is destroyed, but the remaining part hits the
South Atlantic at 200 times the speed of sound. The sea boils and a huge hole is made in
the sea bed. Huge waves are created and spread outwards from the hole. The wall of water,
a kilometer high, rushes towards southern Africa at 800 kilometers an hour. Cities on the
African coast are totally destroyed and millions of people are drowned.
Before the waves reach South America, the second piece of the comet lands in
Argentina. Earthquakes and volcanoes are set off in the Andes Mountains. The shock
waves move north into Califomia and all around the Pacific Ocean. The cities of Los
Angeles, San Francisco and Tokyo are completely destroyed by earthquakes. Millions
of people in the southern half of the earth are already dead, but the north won"t escape
for long. Because of the explosions, the sun is hidden by clouds of dust, temperatures
around the world fall to almost zero.Crops are ruined. The sun won"t be seen again for
many years. Wars break out as countries fight for food. A year later, no more than 10
million people remain alive.
Could it really happen? In fact, it has already happened more than once in the history
of the Earth. The dinosaurs were on the Earth for over 160 million years. Then 65 million
years ago they suddenly disappeared. Many scientists believe that the Earth was hit by
a piece of object in space. The dinosaurs couldn"t live through the cold climate that
followed and died out. Will we meet the same end?
B. An event of imagination.
C. A research on space.
D. A scientific adventure.
B. damages to cities
C. an Earth explosion
D. huge waves
B. Because the light and heat from the sun can not reach the earth.
C. Because people there can not live at the temperature of zero.
D. Because wars break out among countries.
B.what happened 65 million years ago was an invented story
C. the human beings will die out in 2094
D. the Earth could be hit by other objects in space
Edmund Halley was an English scientist who lived over 200 years ago. He studied the
observations of comets(彗星) which other scientists had made. The orbit of one
particular comet was a very difficult mathematical problem. He could not figure it out.
Neither could other scientists who dealt with such problems.
However, Halley had a friend named Isaac Newton, who was a brilliant mathematician.
Newton thought he had already worked out that problem, but he could not find the
paper on which he had done it. He told Halley that the orbit of a comet had the shape
of an ellipse(椭圆形).
Now Halley set to work. He figured out(觯决,计算出) the orbits of some of the
comets that had been observed by scientists. He made a surprising discovery. The
comets that had appeared in the years 1531, 1607 and 1682 all had the same orbit.
Yet their appearances had been 75 to 76 years apart.
This seemed very strange to Halley. Three different comets followed the same orbit.
The more Halley thought about it, the more he thought that there had not been three
different comets, as people thought. He decided that they had simply seen the same
comet three times. The comet had gone away and had come back again.
It was an astonislung idea! Halley felt certain enough to make a prediction(顶言 )
of what would happen in the future. He decided that this comet would appear in the
year 1758. There were 53 years to go before Halley"s prediction could be tested.
In 1758 the comet appeared in the sky. Halley did not see it, for he had died some
years before. Ever since then that comet had been called Halley"s comet, in his honour.
B. the same comet appearing at different times
C. three different comets appearing three times
D.several comets appearing three times
B. by means of his own careful observation
C. by using the work of other scientists
D. by chance
B.1705
C.1706
D. 1707
B. the orbit of a comet
C. Newton and Halley
D. Halley and his discovery
grow in salty water. Most seaweed is red or brown in color. The Japanese people use this plant from the
sea in many ways. From it, they make a food called Kombu. Kombu is seaweed that has been dried,
cooked, and pressed together. Then it is dried again and cut into long pieces. The Japanese eat a lot of
Kombu and like it very much.
Japanese farmers often use seaweed as fertilizer. It makes their plants grow better. Many farmers
also find seaweed and make a fine food for their animals.
From seaweed the Japanese also get iodine (碘) , which they sell to other countries. Iodine is used
in many ways all over the world. It is used in making medicine. It is added to the salt we use at the table.
Scientists even use one form of iodine to "seed clouds" when they want rain to fall.
B. medicine
C. food
D. fertilizer
B. We eat it before meal.
C. We add it to the soup.
D. We add it to the salt we use at the table.
B. Kombu is made into medicine for farmers
C. the Japanese use seaweed in many ways
D. the Japanese eat a lot of Kombu
B. algae are plants from the sea
C. scientists could probably learn more about seaweed
D. seaweed is the only useful algae
basic needs for water-whether for drinking, agriculture, industry or the raising of fish will always have to
be met. Given that premise (前提) , there are two basic routes we can go:more equal access to water or
better engineering solutions.
Looking at the engineering solution first, a lot of my research concentrates on what happens to
wetlands when you build dams in river basins, particularly in Africa. The ecology of such areas is almost
entirely driven by the seasonal changes of the river-the pulse of the water. And the fact is that if you build
a dam, you generally spoil the downstream ecology. In the past, such problems have been hidden by a
lack of information. But in the near future, governments will have no excuse for their ignorance.
The engineers" ability to control water flows has created new kinds of unpredictability too. Dams in
Africa have meant fewer fish, less grazing and less flood- plain (洪泛区) agriculture-none of which were
expected. And their average economic life is assumed to be thirty years. Dams don"t exist forever, but
what will replace them is not clear.
The challenge for the future is to find new means of controlling water. Although GM technology
(转基因) will allow us to breed better dry land crops, there is no market for companies to develop
crops suitable for the micro-climates of the Sahel and elsewhere in Africa. Who is going to pay for
research on locally appropriate crops in the Third World?
B. The engineering solutions to water resource and their limitation.
C. The basic means of controlling water.
D. The challenge for developing crops.
B. More dams should be built in river basins.
C. More wetlands should be protected from destruction.
D. More dry-land crops could be developed in Africa.
3. The author suggests that governments will have no excuse for their careless ignorance in the future
because .
B. the ecological destruction will no longer be a problem in the future
C. the future is an information age
D. governments will face greater challenge in the future
B. less grazing land
C. less farming land
D. less floodplain agriculture
B. researchers have no interest in developing dry land crops
C. research on locally appropriate crops in the Third World may be profitable
D. There is less water resource in the Third World
resources of the sea were unlimited. For example, a noted biologist writing in the mid-19th century
commented that none of the great sea fisheries(渔业) are to be exhausted. Today though, there is
evidence that the resources land and the air, and that the endangered species (种类) include Herring
and Carp as well as the African Elephant, Indian Tiger, and the American Eagle.
Further, the threats to fish are more alarming in some ways than the threats to animals and birds.
This is because fish are a much needed food resource and people throughout the world depend on
fish as an important part of their dish, and the decline (下降) in the fish supply could have extensive
effects on hunger and population.
Fishermen in the North Atlantic alone annually harvest 20 billion pounds of fish to satisfy food
demands, but it is important to recognize that these practices cannot continue without depleting (耗尽)
fish storage within the next few years. Sea resources are rapidly declining in many parts of the world,
and the problem cannot he ignored (忽视) .
We can predict that food supplies in the sea can not last forever.
the sea?
B. Depleted.
C. Limited.
D. Unlimited.
B. The whole world.
C. Asia and America.
D. America.
B. None of the great sea fisheries are to be exhausted.
C. Fish supply has no effects on people.
D. Sea resources are important to people.
B. Threats to Animals and Birds
C. Sea Resources on the Decline
D. Protection of Fish
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