WARNING: Holding a cell phone against your ear or putting it in your pocket may be bad for your health.   

This sentence is a warning that you’d better not put it close to you when a new phone is bought. Apple company, for example, doesn't want IPhones to come closer to you than 1.5 centimeters; Research In Motion, BlackBerry's producer, recommends 2.5 centimeters.

(1)If cell phone use can        health problems, the         will be very serious. Americans spend 2.26 trillion minutes chatting on cell phones every year, which brings $109 billion for the wireless businessmen.

Devra Davis, an epidemiologist(皮肤病专家) who has worked for the University of Pittsburgh, has published a book about mobile phone radiation（辐射）"Disconnect." Davis studies how often brain cancer happens during different age groups. She finds a big increase in brain cancer in the 20-to-29 age group and a drop for the older people.

Children are more easily hurt by radiation than grown-ups, Ms. Davis and other scientists point out. But no studies have yet been finished on cell phone radiation and children, she says.

Henry Lai, a research professor, began lab radiation studies in 1980 and found that mice exposed to(暴露在) radiofrequency（电波频率）radiation had destroyed DNA in their brains.

Ms. Davis recommends using wired earphones（有线耳机）or the phone's speaker. (2)Children should send text messages rather than call, she said, and pregnant（怀孕的） women should keep phones away from their bodies.

1.在（1）句空白处填入适当的词使句意完整、上下文通顺。

2.将（2）句翻译成中文。

3.回答问题：What kind of people with brain cancer are getting more and more?

4.找出同义句。

Scientists are still carrying on with the studies on cell phone radiation and children

5.找出或写出该短文的主题句。

There have been many great inventions or things that changed the way we live. The first great invention was the one that is still very important today——the wheel. This made it easier to carry heavy things and to travel long distance.

For hundreds of years after that there were few inventions that as much effect as the wheel . Then in the early 1800s the world started to change. There was little unknown land left in the world. People didn’t have to explore much any more. They began to work instead to make life better.

In the second half of the 19^th century many great inventions were made. Among them were the camera, the light and the radio. These all play a big part in our daily life today.

The first part of the 20^th century saw more great inventions. The helicopter in 1909, movies with sound in 1926, the computer in 1928, jet planes in 1930. This was also a time when a new material was first made. Nylon came out in 1935. It changed the kind of clothes people wore.

The middle part of the 20^th century brought new ways to help people get over diseases. They worked very well. They made people healthier and allowed them to live longer. By the 1960s most people could expect to live to be at least 60.

By this time most people in developed countries had a very good life. Of course new inventions continued to be made. But man now had a desire(渴望) to explore again. The earth was known to man but the stars were not. Man began looking for ways to go into space. Russia made the first step. Then United States took a step. Since then other countries , including China and Japan, have made their own steps into space.

In 1969 man took his biggest step away from earth. Americans first walked on the moon. This is certainly just a beginning, though. New inventions will some day allow us to do things we have never yet dreamed of.

1. This passage talks mainly about         .

   A. why cars were very important

   B. when light was invented

   C. how inventions affect people’s daily life

   D. which country made the first step into space

2.According to the passage man didn’t have a desire to explore a lot         .

   A. at the beginning of 1800s             B. in the 1960s 

   C. since the 1900s                     D. from the 1800s to 1960s

3.In the 1800s, people began to work in order to make      

   A. explorations    B. their life better     C. discoveries      D. a trip to space

4. Nylon came out of five years later than        .

   A. radio          B. camera           C. jet planes          D. movies

5.People can live longer lives because        that help cure diseases have worked very well.

   A. doctors        B. new ways         C. medicines       D. new hospitals

There have been many great inventions or things that changed the way we live. The first great invention was the one that is still very important today——the wheel. This made it easier to carry heavy things and to travel long distance.

For hundreds of years after that there were few inventions that had as much effect as the wheel . Then in the early 1800s the world started to change. There was little unknown land left in the world. People didn’t have to explore much any more. They began to work instead to make life better.

In the second half of the 19th century many great inventions were made. Among them were the camera, the light and the radio. These all play a big part in our daily life today.

The first part of the 20th century saw more great inventions. The helicopter in 1909, movies with sound in 1926, the computer in 1928, jet planes in 1930. This was also a time when a new material was first made. Nylon came out in 1935. It changed the kind of clothes people wore.

The middle part of the 20th century brought new ways to help people get over diseases. They worked very well. They made people healthier and allowed them to live longer. By the 1960s most people could expect to live to be at least 60.

By this time most people in developed countries had a very good life. Of course new inventions continued to be made. But man now had a desire(渴望) to explore again. The earth was known to man but the stars were not. Man began looking for ways to go into space. Russia made the first step. Then United States took a step. Since then other countries , including China and Japan, have made their own steps into space.

In 1969 man took his biggest step away from earth. Americans first walked on the moon. This is certainly just a beginning, though. New inventions will some day allow us to do things we have never yet dreamed of.

1.This passage talks mainly about _______________ .

A．why cars were very important

B．when light was invented

C．how inventions affect people’s daily life

D．which country made the first step into space

2.According to the passage man didn’t have a desire to explore a lot ___________.

A．at the beginning of 1800s

B．in the 1960s

C．since the 1900s

D．from the 1800s to 1960s

3.Nylon came out five years later than____________ .

A．radio             B．camera           C．jet planes         D．movies

4.People can live longer lives because ________ that help cure diseases have worked very well.

A．doctors                               B．new ways

C．medicines                             D．new hospitals

There have been many great inventions or things that changed the way we live. The first great invention was the one that is still very important today——the wheel. This made it easier to carry heavy things and to travel long distance.

For hundreds of years after that there were few inventions that as much effect as the wheel . Then in the early 1800s the world started to change. There was little unknown land left in the world. People didn’t have to explore much any more. They began to work instead to make life better.

In the second half of the 19^th century many great inventions were made. Among them were the camera, the light and the radio. These all play a big part in our daily life today.

The first part of the 20^th century saw more great inventions. The helicopter in 1909, movies with sound in 1926, the computer in 1928, jet planes in 1930. This was also a time when a new material was first made. Nylon came out in 1935. It changed the kind of clothes people wore.

The middle part of the 20^th century brought new ways to help people get over diseases. They worked very well. They made people healthier and allowed them to live longer. By the 1960s most people could expect to live to be at least 60.

By this time most people in developed countries had a very good life. Of course new inventions continued to be made. But man now had a desire(渴望) to explore again. The earth was known to man but the stars were not. Man began looking for ways to go into space. Russia made the first step. Then United States took a step. Since then other countries , including China and Japan, have made their own steps into space.

In 1969 man took his biggest step away from earth. Americans first walked on the moon. This is certainly just a beginning, though. New inventions will some day allow us to do things we have never yet dreamed of.

1. This passage talks mainly about         .

   A. why cars were very important

   B. when light was invented

   C. how inventions affect people’s daily life

   D. which country made the first step into space

2.According to the passage man didn’t have a desire to explore a lot         .

   A. at the beginning of 1800s             B. in the 1960s 

   C. since the 1900s                     D. from the 1800s to 1960s

3.In the 1800s, people began to work in order to make      

   A. explorations    B. their life better     C. discoveries      D. a trip to space

4. Nylon came out of five years later than        .

   A. radio          B. camera           C. jet planes          D. movies

5.People can live longer lives because        that help cure diseases have worked very well.

   A. doctors        B. new ways         C. medicines       D. new hospitals