题目内容
“Millions of young people will lose their hearing in five years if they listen to MP3 or MP4 players at a too high voice every day,” scientists say recently.
Do you often listen to MP3 players at a too high voice? Are you frightened to hear this?
The sizes of MP3 players are very small, but small MP3 players make it easy to take hundreds of songs with you. So many young people carry them and listen to music every day. MP3 players are very popular among students.
The scientists say teenagers should be far from high volume (音量), including mobile phones’ noise. A study says, “High volume and long listening time can cause hearing problems.” They think if young people listen at more than 89 decibels (分贝) every day, they will lose their hearing in five years. A scientist said, “So many young people often use personal music players and mobile phones at a high voice. I am afraid that they may be losing their hearing.
So let’s turn our MP3 players down!
48. According to the passage, which of the following is true?
A. Scientists tell young people to turn off their MP3 players.
B. Teenagers will lose their hearing if they listen to hundreds of songs in MP3 players.
C. A person will lose hearing in 5 years if he or she listens to an MP3 player every day.
D. The mobile phone can also cause hearing problems if we don’t use it correctly.
49. The underlined word “they” (Paragraph 4) most probably refers to ______.
A. scientists B. MP3 players C. mobile phones D. teenagers
50. Which might be the best title for this passage?
A. Turn your MP3 players down! B. Never use MP3!
C. How to protect your hearing. D. Young people’s hearing.
DDA
习题精选系列答案“Mars Orbit Express” is a space probe (探测器). It was sent towards Mars by American scientists on August 12th，2005. Its tasks are to study Mars’ atmosphere and return photos to Earth. But before that “Mars Orbit Express” must travel about 100 hundred million kilometers and seven months. It reached Mars’ orbit(轨道)in March，2006.
Mars and Earth have similar weight and size. However，Mars is closer to the sun than Earth. Mars is very cold. The average temperature is below 50℃. The temperature at noon only reaches 20℃ during a Mars day. Its atmosphere is mostly CO2. It has much sand and two moons---Phobos and Deimos.
Scientists think Earth and Mars had similar beginnings 4.6 billion years ago. But while Earth supports millions of lives，Mars becomes bad. “Earth easily could have turned out like that.” said an scientist, “It is important for us to find out why and Mars Orbit Express’ should do that.”“Mars Orbit Express” also would help scientists to learn what might happen to Earth in the future. “Mars Orbit Express” would work for about four years.
【小题1】 What can you see through a telescope when watching Mars? ________.
| A．Much sand | B．A red star | C．Its atmosphere | D．Its size |
| A．taking pictures of Mars |
| B．studying the weight of Mars |
| C．finding out distance between Earth and Mars |
| D．telling the time it takes to go from Earth to Mars |
| A．Mars has a long history | B．Mars is big and heavy |
| C．Mars is close to the sun | D．Mars’ atmosphere is mainly O2. |
| A．Mars：differences from Earth | B．A probe：to learn more about Mars |
| C．Mars: change of temperature | D．A probe：to tell the future of Earth |
Many countries celebrate (庆祝) World Book Day. On that day, millions of school children can buy books at a much lower price than usual in any bookstore in England. It has been done every year since 1998. World Book Day is also celebrated in China. Wen Jiabao, Premier of China, is an avid reader. He does lots of reading every day though he is very busy. On World Book Day 2009, he called on (号召) people to do more reading. Wen suggested that young people should spend more time reading. “Books can not change the world, but people can change the world by changing themselves through reading,” he said.
Reading helps us become more knowledgeable and smarter. Reading helps us to follow the latest developments of science and technology (技术). Reading gives us information about other cultures and places in the world. Reading is also one of the most important ways to learn a foreign language like English. We all know that it is difficult to learn everything in the classroom, for example, the ways English people are living and working today can be learnt by reading.
Books, magazines, newspapers and other kinds of reading materials can help us to know more about the outside world. Therefore, it is necessary for us to spend time reading every day.
【小题1】When is World Book Day?
| A．August 8 every year. | B．March 12 every year. |
| C．April 23 every year. | D．June 6 every year. |
| A．loves reading | B．never reads | C．does some reading | D．hates reading |
| A．learn foreign languages | B．do more reading |
| C．buy more books | D．know more about science |
| A．learning English better | B．knowing more about cultures |
| C．improving your health | D．knowing more about the outside world |
| A．World Book Day in England. |
| B．Suggestions on Reading. |
| C．World Book Day in China. |
| D．World Book Day and the Advantages of Reading. |
The earth is our home；we must take Care of it. This means keeping the land，air and water clean.
Pollution is a dirty word. To pollute means to make things unfit(不合适的)or unclean to use. Pollution comes in many ways. We see it，smell it，taste it and drink it. Pollution is beginning to threaten(威胁)our health，or happiness and our life.
Man. has been polluting the earth from the time he first made fire，washed his clothes in the river and threw his waste on the ground. When land was used up or water became dirty. Men moved to another place. At first the problem was not so serious because there was plenty of clean air，land and water. There weren’t so many people then and their wants(需求)were fewer. All the dirty things could be absorbed(吸收)by nature and soon. covered over(恢复)， But this is no longer true. The increase of population(人口增长)and the development of industry have changed that. Man is slowly polluting. his environment.
Through the use of poison(农药)，mall has polluted land! killing the animal. By putting dirty water and chemicals into rivers and lakes we have polluted our drinking water，killing the fish.
Our increasing population is part of the problem. More people more waste.
Where is this all to end? Are we turning the world into a big rubbish dump，or is there any hope that we can get rid of(摆脱)the pollution ?Luckily，millions of people have been warned of the danger of pollution. Large numbers of people are now working hard to bring pollution under
【小题1】Which sentence is WRONG?
| A．We live on the earth，so we should look after it. |
| B．To pollute means to make air ，water and land unfit for use. |
| C．All the waste produced by modem industry can be absorbed. |
| D．Man is now fighting against different kinds of pollution. |
| A．化学 | B．化学物质 | C．化学的 | D．医学的 |
| A．because of the increase of population and the development of industry，more and more waste is produced |
| B．we need more people，not more waste |
| C．there isn’t any hope that we can get rid of the pollution |
| D．more people have been warned of the danger of more waste. |
| A．doesn’t know how to control pollution |
| B．still doesn’t realize how serious pollution is |
| C．is doing something to control pollution |
| D．begins to understand the pollution |
We have always been interested in the moon. 2000 years ago people already knew it moved around the earth and where it would be in the sky at different times of the year. At that time, everything about the moon was learned by watching it carefully in the sky.
When scientists could use telescopes(望远镜) to study the moon more closely, their ideas began to change. They could see the moon was made of rocks. Most scientists thought moon rocks would be different from those on Earth. This was because they believed the moon had once been a planet that had been caught in the earth’s gravity millions of years earlier.
In 1969 moon rocks were finally brought to the earth and studied. Much to their surprise, scientists found that, except for water, the moon and the earth were made of the same things. Once again new ideas were needed for this new information.
After years of study, most scientists now think that the moon was once part of Earth. They believe very early in its history, maybe 4 million years ago, something about the size of Mars hit Earth. This sent billions of rocks into space around our planet. These rocks slowly joined together and after many years became the moon.
In the future, even though our ideas about the moon may change again, we will still be interested in it.
1.From the passage we know the moon was made of_____________.
|
A．earth |
B．rocks |
C．water |
D．metal |
2.In the passage the writer wants to tell us ___________________.
|
A．why people are interested in the moon |
|
B．how ideas about the moon have changed over time |
|
C．where the moon came from in the past |
|
D．that people have finally learned the truth about the moon. |
3.Before 1969 most scientists thought the moon was ______________.
|
A．part of the earth billions of years earlier |
|
B．older than the earth |
|
C．a planet caught by the earth’s gravity |
|
D．made of the same things as the earth |
4.From this passage we can learn that ___________________.
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A．scientists in the past were not clever |
|
B．the earth was once part of the moon |
|
C．we now know everything about the moon |
|
D．new information brings new ideas |