A dam is a man-made structure built across a river. Most dams are built to control a river’s water flow, improve navigation and control flooding. However, some dams are built to produce hydro-electric power.

Hydro-electric power is produced as water passes through a dam, and into a river below. The more water that passes through a dam, the more energy is produced. Once a dam is built, a man-made lake is created behind the dam.

Electricity is produced by a kind of equipment called a turbine(水轮机). Turbines contain metal coils(线圈) surrounded by magnets(磁铁). When the magnets move round rapidly over the metal coils, electricity is produced. Turbines are located inside dams. The falling water makes the magnets go around the coils.

Dams provide clean energy, but they can also harm the environment. Species that use rivers to reproduce are often hurt by dams. In the Northwest of the US, the population of fishes has dropped from 16 million to 2.5 million since hydro-electric plants were built on the Columbia River. Dams all over the world have hurt some species. 

  The highest dam in the Unites States is located near Oroville, California. The Oroville Dam towers 230 meters and is more than a mile wide. This dam was built in 1968, 22 years after the Hoover Dam. The Hoover Dam, on the Nevada-Arizona border controls the Colorado river. It is 221 meters high and has 2.6 million hectare-meters of water.

The highest dam in the world is the Nurek Dam on the Vakhsh River in Tadzikistan, a country in central Asia. This dam is 300 meters tall. 

Which of the following statements is NOT true according to the passage?              

A. Some dams are built for controlling a river’s water flow.

B. Hydro-electric power is usually produced through a dam.

C. Dams can offer energy and they are harmless to the environment.

D. Generally speaking, where there is a dam, there is a man-made lake.

The third paragraph mainly tells us _____.                          

  A. how hydro-electric power is produced

  B. What a turbine is and how it works 

  C. how the magnets and the metal coils work

  D. how the falling water passes through a turbine                     

The dam which controls the Colorado river is ____.                  

A. the Oroville Dam  B. the Hoover Dam  C. the Nurek Dam  D. the Vakhsh Dam

A dam is a man-made structure built across a river. Most dams are built to control a river’s water flow, improve navigation and control flooding. However, some dams are built to produce hydro-electric power.

Hydro-electric power is produced as water passes through a dam, and into a river below. The more water that passes through a dam, the more energy is produced. Once a dam is built, a man-made lake is created behind the dam.

Electricity is produced by a kind of equipment called a turbine(水轮机). Turbines contain metal coils(线圈) surrounded by magnets(磁铁). When the magnets move round rapidly over the metal coils, electricity is produced. Turbines are located inside dams. The falling water makes the magnets go around the coils.

Dams provide clean energy, but they can also harm the environment. Species that use rivers to reproduce are often hurt by dams. In the Northwest of the US, the population of fishes has dropped from 16 million to 2.5 million since hydro-electric plants were built on the Columbia River. Dams all over the world have hurt some species. 

  The highest dam in the Unites States is located near Oroville, California. The Oroville Dam towers 230 meters and is more than a mile wide. This dam was built in 1968, 22 years after the Hoover Dam. The Hoover Dam, on the Nevada-Arizona border controls the Colorado river. It is 221 meters high and has 2.6 million hectare-meters of water.

The highest dam in the world is the Nurek Dam on the Vakhsh River in Tadzikistan, a country in central Asia. This dam is 300 meters tall. 

Which of the following statements is NOT true according to the passage?              

A. Some dams are built for controlling a river’s water flow.

B. Hydro-electric power is usually produced through a dam.

C. Dams can offer energy and they are harmless to the environment.

D. Generally speaking, where there is a dam, there is a man-made lake.

The third paragraph mainly tells us _____.       56-60 ADB                    

  A. how hydro-electric power is produced

  B. What a turbine is and how it works 

  C. how the magnets and the metal coils work

  D. how the falling water passes through a turbine                     

The dam which controls the Colorado river is ____.                  

A. the Oroville Dam  B. the Hoover Dam  C. the Nurek Dam  D. the Vakhsh Dam

A new study suggests that the round­the­clock availability that cell phones have brought to people's lives may take a toll on family life. The study，which followed more than 1,300 adults over 2 years, found that those who consistently used a mobile phone throughout the study period were more likely to report negative “spillover” between work and home life—and，in turn，less satisfaction with their family life.
Spillover essentially(本质上)means that the line between work and home begins to become unclear. Work life may invade home life when a parent is taking job­related calls at home，for instance—or family issues may start to take up work time. For example，a child may call mum at work，telling her “microwave exploded”，explained Noelle Chesley，an assistant professor of sociology at the University of Wisconsin­Milwaukee and the author of the study. The problem with cell phones seems to be that they are allowing for even more spillover between work and home.
This may be especially true for working women，the study found. Among men，consistent use of mobile phones seemed to allow more work issues to creep (潜入)into family time. But for women，the spillover tended to go in both directions. Being “connected” meant that work cut into home time，and family issues came into work life.
Cell phones seem to be opening more lines for stressful exchanges among family members. But there may be ways to control the spillover，according to Chesley. Employers, she said，could look at their policies on contacting employees after hours to make sure their expectations are “reasonable”．For their part，employees could decide that cell phones go off during family time, Chesley said.
【小题1】What does the underlined phrase “take a toll on” probably mean in Paragraph 1?

B
Joanne was stuck in a traffic jam in central Birmingham at 5：30．and at 6：30 she was expected to be chairing a meeting of the tennis club．At last，the traffic was moving．She swung quickly racing to her house As she opened the door，she nearly tripped over Sheba．
“Hey，Sheba，”she said，“I've got no time for you now，hut I'll take you out as soon as I get
back from tennis club．”Then she noticed Sheba seemed to be coughing or choking Obviously，she could hardly breathe．Immediately．Joanne realized she would have to take her to the vet(兽医)
When she got there，the vet was just about to close for the day Seeing the state of Sheba，Dr．Sterne brought her quickly into his office．
“Listen，doctor，I'm really in a rush to get to a meeting can I leave her with you，and go and get changed? I'll be back in ten minutes to pick her up，and then I'll take her on to the meeting with me Is that OK?”
“Sure．”said the doctor
Joanne made the quick trip back to her house in a couple of minutes'．As she was once more
entering the hallway，the phone by the door began to ring．
“This is Dr．Sterne，”said an anxious voice．“I want you to get out of that house immediately，”said the doctor's voice．“I'm coming round fight away，and the police will be there any time now．Wait outside!”
At that moment，a police car screeched to a stop outside the house．Two policemen got out and ran into the house．Joanne was by now completely confused and very frightened．Then the doctor arrived．
“Where’s Sheba? Is she OK?”shouted Joanne．
“She’s fine，Joanne．I took out the thing which was choking her，and she’s OK now．”
Just then，the two policemen reappeared from the house，half-carrying a white—faced man，who could hardly walk．There was blood all over him．
“My God，”said Joanne，“how did he get in there? And how did you know he was there?”
“I think he must be a burglar．”said the doctor．“I knew he was there because when I finally removed what was stuck in Sheba’s throat：it turned out to be three human fingers”
60．What was Joanne supposed to do at 6：30？
A．To walk her dog．         B．To see her doctor．
C．To attend a club meeting．   D．To play tennis with her friends．
61．Joanne wanted to get back to her home again           ．
A．to dress up for the meeting      B．to phone the police station
C．to catch the badly hurt burglar     D．to wait for her dog to be cured  
62．From the passage，we can infer that         ．
A．Sheba fought against the burglar
B．the police found the burglar had broken in
C．Joanne had planned to take her dog to the meeting
D．the doctor performed a difficult operation on the dog
63．In this passage，the writer intends to tell us that the dog is           ．
A．clever                 B．friendly              C．frightening             D．Devoted

A new study suggests that the round­the­clock availability that cell phones have brought to people's lives may take a toll on family life. The study，which followed more than 1,300 adults over 2 years, found that those who consistently used a mobile phone throughout the study period were more likely to report negative “spillover” between work and home life—and，in turn，less satisfaction with their family life.
Spillover essentially(本质上)means that the line between work and home begins to become unclear. Work life may invade home life when a parent is taking job­related calls at home，for instance—or family issues may start to take up work time. For example，a child may call mum at work，telling her “microwave exploded”，explained Noelle Chesley，an assistant professor of sociology at the University of Wisconsin­Milwaukee and the author of the study. The problem with cell phones seems to be that they are allowing for even more spillover between work and home.
This may be especially true for working women，the study found. Among men，consistent use of mobile phones seemed to allow more work issues to creep (潜入)into family time. But for women，the spillover tended to go in both directions. Being “connected” meant that work cut into home time，and family issues came into work life.
Cell phones seem to be opening more lines for stressful exchanges among family members. But there may be ways to control the spillover，according to Chesley. Employers, she said，could look at their policies on contacting employees after hours to make sure their expectations are “reasonable”．For their part，employees could decide that cell phones go off during family time, Chesley said.
【小题1】What does the underlined phrase “take a toll on” probably mean in Paragraph 1?