For more than twenty years scientists have be...

For more than twenty years scientists have been searching for signs of life on other planets. Most of 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 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, 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 (进化) 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 life exists on other planets. Some believe that twenty years of searching without any intelligible 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 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.

1.According to the passage, how many planets in our galaxy might be inhabitable?

A. 15 billion.　　 B. 10 billion.

C. 5 billion　　 D. 200 billion

2.The first paragraph in this passage is mainly about　　 ________.

A. why scientists are looking for signs of life on other planets

B. how 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

3.The underlined word “monitor” in the passage means “________”.

A. find　　 B. follow

C. form　　 D. check

4.Which of these statements is True based on the information in the passage?

A. Scientists are tying different ways to find signs of life on other planets.

B. Most scientists believe that there is intelligent life on other planets.

C. The earth is one of the oldest planets in our galaxy.

D. Scientists don’t believe that there might be life on other planets.

高三英语阅读理解中等难度题查看答案及解析

For more than twenty years scientists have been searching for signs of life on other planets. Most of 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 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, 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 (进化) 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 life exists on other planets. Some believe that twenty years of searching without any intelligible 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 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.

1.According to the passage, how many planets in our galaxy might be inhabitable?

A.15 billion. B.10 billion.

C.5 billion. D.200 billion

2.The first paragraph in this passage is mainly about　　 ________.

A.why scientists are looking for signs of life on other planets

B.how 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

3.The underlined word “monitor” in the passage means “________”.

A.find B.follow

C.form D.check

4.Which of these statements is True based on the information in the passage?

A.Scientists are tying different ways to find signs of life on other planets.

B.Most scientists believe that there is intelligent life on other planets.

C.The earth is one of the oldest planets in our galaxy.

D.Scientists don’t believe that there might be life on other planets.

高三英语阅读理解中等难度题查看答案及解析

（重庆一中2016届高三5月模拟）For more than twenty years scientists have been searching for signs of life on other planets. Most of 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 to such messages.

Scientists are using powerful radio telescopes to listen to signals from about 1, 000 stars, all within 100 light years of earth. In addition, they will scan 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 they stands out from the background noise.

Of the 200 billion stars in the Milky Way galaxy, 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 life exists on other planets. Some believe that twenty years of searching without any intelligible 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 is only about five billion years old, our galaxy is about 20 billion years old. In that time, some scientists think it is likely that civilization much more advanced than ours have developed. Perhaps these civilizations 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.

1.According to the passage, how many planets in our galaxy might be inhabitable?

A. 5 billion．　　 B. 10 billion.

C. 15 billion.　　 D. 200 billion

2.The first paragraph in this passage is mainly about ________ .

A. how scientists are looking for signs of life on other planets

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

3.The underlined word “monitor” in the passage means“ ________ ”.

A. find　　 B. imitate

C. check　　 D. form

4.Which of these statements is true based on the information in the passage?

A. The earth is one of the oldest planets in our galaxy.

B. Most scientists believe that there is intelligent life on other planets.

C. Scientists are trying different ways to find signs of life on other planets.

D. Scientists don’t believe that there might be life on other planets.

高三英语阅读理解中等难度题查看答案及解析

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项

For more than twenty years scientists have been searching for signs of life on other planets. Most of 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 to such messages.

Scientists are using powerful radio telescopes to listen to signals from about 1, 000 stars, all within 100 light years of earth. In addition, they will scan 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 they stands out from the background noise.

Of the 200 billion stars in the Milky Way galaxy, 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 life exists on other planets. Some believe that twenty years of searching without any intelligible 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 is only about five billion years old, our galaxy is about 20 billion years old. In that time, some scientists think it is likely that civilization much more advanced than ours have developed. Perhaps these civilizations 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.

1.According to the passage, how many planets in our galaxy might be inhabitable?

A. 5 billion．　　　　　　　　 B. 10 billion.

C. 15 billion.　　　　　　　　 D. 200 billion

2.The first paragraph in this passage is mainly about ________ .

A. how scientists are looking for signs of life on other planets

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

3.The underlined word “monitor” in the passage means“ ________ ”.

A. find　　　　　　　 　 B. imitate

C. check　　　　　　　　 　 D. form

4.Which of these statements is true based on the information in the passage?

A. The earth is one of the oldest planets in our galaxy.

B. Most scientists believe that there is intelligent life on other planets.

C. Scientists are trying different ways to find signs of life on other planets.

D. Scientists don’t believe that there might be life on other planets.

高三英语阅读理解中等难度题查看答案及解析

阅读下列短文，根据所读内容在文章后的表格中填入恰当的单词（注意：表格中的每个空只填一个单词）

For more than twenty years scientists have been seeking to understand the mystery of the ‘‘sixth sense" of direction．By trying out ideas and solving problems one by one，they are now getting closer to one answer．

One funny idea is that animals might have a built-in compass(指南针)．

Our earth itself is a big magnet(磁体)．So a little magnetic needle that swings freely lines

itself with the big earth magnet to point north When people discovered that idea about a thousand years ago and invented the compass，it allowed sailors to navigate (航海)on ocean voyages, even under cloudy skies.

Actually the idea of the living compass came just from observing animals in nature．

Many birds migrate twice a year between their summer homes and winter homes．Some of them fly for thousands of kilometers and mostly at night．Experiments have shown that some birds can recognize star patterns．But they can keep on course even under cloudy skies．How can they do that?

A common bird that does not migrate but is great at finding its way home is the homing pigeon．Not all pigeons can find their way home．Those that can are very good at it，and they have been widely studied．

One interesting experiment was to attach little magnets to the birds’ heads to block their magnetic sense—just as a loud radio can keep you from hearing a call to dinner．On sunny days, that did not fool the pigeons．Evidently they can use the sun to tell which way they are going．But on cloudy days，the pigeons with magnets could not find their way．It was as if the magnets had blocked their magnetic sense．

Similar experiments with the same kind of results were done with honeybees．These insects also seem to have a special sense of direction．

In spite of the experiments，the idea of an animal compass seemed pretty extraordinary．How

would an animal get the magnetic stuff for a compass.

An answer came from an unexpected source．A scientist was studying bacteria that live in the

mud of ponds and marshes．He found accidentally little rod-like bacteria that all swam together inone direction—north．

Further study showed that each little bacterium had a chain of dense particles inside，which

proved magnetic．The bacteria had made themselves into little magnets that could line up with the

earth’s magnet．

The big news was that a living thing，even a simple bacterium，can make magnetite．That led

to a search to see whether animals might have it.. By using a special instrument called magnetometer，scientists were able to find magnetite in bees and birds，and even in fish．In each  animal，except for the bee．the magnetic stuff was always in or closer to the brain．Thus．the idea of a built—in animal compass began to seem reasonable．

高三英语其他题中等难度题查看答案及解析

.-- His father is a professor and has been teaching in the university for more than twenty years.

-- _____.

高三英语单项填空简单题查看答案及解析

I don’t smoke now, but I _______ for more than twenty years.

A. smoked                                     B. was smoking                C. have smoked                            D. had smoked

高三英语单项填空中等难度题查看答案及解析

Legos have been a kind of popular toys for children for more than 60 years. When children get older, boxes of plastic Lego bricks often end up unused and stored in out-of-the-way places around the homes. Parents sometimes end up throwing the Legos away.

Now, the Lego Group toy company is testing a program to make sure the unwanted bricks do not go to waste. The program is called Lego Replay. It aims to make sure the unwanted building blocks continue to make children happy.

Tim Brooks is the Lego company’s vice president of environmental sustainability. He said, "Nearly all Lego bricks we see that are out there have lots more play value in them — multi-generation of play value. It’s a waste of energy and resources to grind them up (碾碎）and make new bricks. ”

Brooks said the idea came from parents who do not know what to do with the old bricks. Placing old Legos in waste containers is not a good answer. Birds and other wildlife may try to eat what looks like Colorful food — with deadly results.

With the Lego Replay program, parents load unwanted Legos of all shapes and colors into boxes. Then, they go to the program website and print out a mailing label. The boxes are sent to processing centers, where the bricks are sorted, cleaned and shipped to aid groups and donation centers.

The Lego Replay test program is set to last through March. If it is successful, the program may be expanded to include other Lego products.

The Lego Group is also looking at other materials to use in their toys. While plastic has proved to be the strongest material, Lego has begun making some bricks out of sugar cane(甘蔗).

1.What’s the main purpose of Lego Replay?

A.To entertain those children without toys.

B.To make unwanted Lego bricks reused.

C.To prevent parents to throw the Legos away.

D.To avoid using unwanted bricks by storing them.

2.Where are unwanted Lego bricks sorted and cleaned according to Lego Replay?

A.At processing centers.

B.At donation centers.

C.On the program website.

D.In the owners’ homes.

3.What does Brooks probably agree with?

A.Lego bricks waste too many resources.

B.Unwanted Lego bricks still have value.

C.We should store old Legos in waste containers.

D.Lego bricks are favorite food of some birds.

4.What does the Lego Group explore according to the last paragraph?

A.More other Lego products.

B.Proper use of plastics.

C.Similar products to sugar cane.

D.New materials of producing bricks.

高三英语阅读理解简单题查看答案及解析

People have been growing chrysanthemums（菊花）for more than 2,000 years. Mums make bright and colorful gardens. People in China and other Asian cultures make tea with the flowers.

One basic kind of mum is the garden mum. The other basic kind is the florist mum. The garden mum is better able to handle different growing conditions.

There are many varieties of mums. The decorative mum is often seen in gardens. Another popular type, the quill mum, has long, straight petals（花瓣）like a tube or needle.

Chrysanthemum blooms can be white, yellow, gold, red or other colors. The plants often grow one meter high.

The soil for chrysanthemums should be kept moist but well drained so it does not get too wet.

Newly-planted mums should be watered two or three times a week, depending on conditions. Plants established in the ground may do well just with normal rainfall.

Mums grow best in full sunshine. They produce colorful blooms when days get shorter and nights get longer. The life cycle of the plant depends on the amount of daylight. This is why experts advise against placing mums near night lights or street lights. The light may interfere with their normal growth cycle. The plants may develop buds too soon.

In climates where temperatures fall below freezing, plant mums at least six weeks before the first frost. That way, the plants will be well established for cold weather.

Some gardeners say the most beautiful presentation comes from planting mums close together. But be sure to leave enough space to let air flow between the plants. If not, there may be a greater chance of disease.

To get more blooms, gardeners pinch（掐）back the branches when new growth has reached fifteen centimeters. Squeeze about five to seven centimeters off each branch. Pinch it again when a branch grows another twelve to fifteen centimeters. Stop the pinching about one hundred days before you want the plants to bloom.

1. What has a great effect on the life cycle of the mum?

A. The conditions of the soil.            B. The amount of daylight.

C. The amount of rainfall.               D. Cold weather.

2.Why do gardeners pinch back the branches when new growth reaches certain length?

A. To make mums grow thick.          B. To get more blooms.

C. To prevent mums from falling ill.      D. To let air flow between the plants.

3. Which of the following is true according to the passage?

A. Growing mums has a very long history and all the people in the world like making tea with mums.

B. Mums can grow one meter high and the closer they are planted, the higher they grow.

C. Though planting mums close together can make them look more beautiful, enough space should be left.

D. The petals of mums are long and straight and the more water mums get, the more quickly they grow.

高三英语阅读理解中等难度题查看答案及解析

Automatic dishwashers have been around for more than 100 years. It started in 1886 with Josephine Cochrane, a woman in Shelbyville, Illinois. She was a rich woman who could afford servants to wash her dishes, so she really didn’t mind the work. What she did mind was that her servants broke the dishes. She hosted quite a few dinner parties, and after every party the servants broke more of her expensive dishes.

Finally, Cochrane took action. First, she measured her dishes and bent wire into racks to hold them. Next, she put the racks on a wheel in a large copper boiler. Then, the boiler sprayed hot, soapy water on the dishes as a motor turned the wheel. After a hot water rinse(冲洗), the dishes were clean!

Josephine Cochrane’s friends were impressed with the machine and asked her to build more. After that, word got out fast. Soon hotel and restaurant owners who didn’t like broken dishes also were interested. Cochrane then knew that she had a wonderful machine, so she received a patent from the government, which said that only the inventor can make money from an invention. Then in 1893 Chicago held a World’s Fair where inventions from all over the world were shown. Cochrane’s labor-saving machine was a big hit. Her dishwasher won the highest award.

Cochrane’s company came out with a smaller machine in 1914. It was supposed to be for the ordinary home, but it wasn’t an immediate success. Many homes couldn’t produce the extremely hot water it needed. Also, in most homes, dishwashing wasn’t considered very difficult compared to most other housework. In fact some people liked to relax at the sink after a hard day! Sales of the home model finally picked up in the 1950s when people had more money and wanted to have more time to enjoy themselves. Now many homes have electric dishwashers that aren’t very different from the one Josephine Cochrane invented more than 100 years ago.

1.Why did Josephine Cochrane invent the dishwasher?

A.To reduce the number of servants.

B.To avoid possible damage to the dishes.

C.To host more dinner parties.​

D.To make the dishes cleaner.

2.What does the underlined words in Paragraph 3 suggest?

A.The machine wasn’t as efficient as described.

B.Josephine Cochrane could no longer keep it a secret.

C.Josephine’s friends soon began to talk about the new machine.

D.The invention drew immediate attention of the public.

3.The smaller machine became popular only when_____.

A.people’s living conditions improved​

B.hot water was not needed

C.housework became easier​

D.people had more relaxing jobs

4.Compared with Cochrane’s invention, modern electric dishwashers _____.

A.cost less money

B.are quite different

C.wash many other things

D.are much the same

高三英语阅读理解中等难度题查看答案及解析