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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
查看习题详情和答案>>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
查看习题详情和答案>>| 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 world is the Nurek Dam on the Vakhsh River in Tadzikistan, a country in central Asia. This dam is 300 meters tall. 1. 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. 2. 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 3. The dam which controls the Colorado river is ____. A. the Oroville Dam B. the Hoover Dam C. the Nurek Dam D. the Vakhsh Dam |
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B
When I asked my daughter which item she would keep; the phone, the car, the cooker, the computer, the TV, or her boyfriend, she said “the phone”. Personally, I couldn’t do without the phone entirely, which makes me unusual, Because the telephone is changing our lives more than any other piece of technology.
Point 1 The telephone creates the need to communicate, in the same way that more roads create more traffic. My daughter comes home from school at 4:00 pm and then spends an hour on the phone talking to the very people she has been with at school all day. If the phone did not exist, would she have anything to talk about?
Point 2 The mobile phone means that we are never alone. “The mobile saved my life,” says Crystal Johnstone. She had an accident in her Volvo on the A45 between Otley and Skipton. Trapped inside, she managed to make the call that brought the ambulance to her rescue.
Point 3 The mobile removes our secret. It allows marketing manager of Haba Deutsch, Carl Nicolaisen, to ring his sales staff all round the world at any time of day to ask where they are , where they are going, and how their last meeting went.
Point 4 The telephone separates us. Antonella Bramante in Rome says, “We worked in separate offices but I could see him through the window. It was easy to get his number. We were so near——but we didn’t meet for the first two weeks!”
Point 5 The telephone allows us to reach out beyond our own lives. Today we can talk to several complete strangers simultaneously (同时地) on chat lines (at least my daughter does. I wouldn’t know what to talk about). We can talk across the world. We can even talk to astronauts (if you know any) while they’re space-walking. And, with the phone line hooked up to the computer, we can access the Internet, the biggest library on Earth.
45．How do you understand ‘Point 1 —The telephone creates the need to communicate,…’？
A．People don’t communicate without telephone.
B．People communicate because of the creating of the telephone.
C．People communicate more since telephone has been created.
D．People communicate more because of more traffic.
46．Which points do you think support the idea that phones improve people’s life?
a．Point 1． b．Point2． c．Point3． d．Point 4． e．Point 5．
A．c, d B．a, e C．a, c D．b, e
47．It is possible to talk to several complete strangers simultaneously through .
A．the TV screen B．a fax machine
C．the phone line hooked up to the computer D．a microphone
48．The best heading for the passage is .
A．Phone Power B．Kinds of Phone
C． How to Use Phones D．Advantage of Phones
查看习题详情和答案>>On a hike through the bush, he came across a young bull elephant standing with one leg raised in the air．The elephant 1 greatly pained, so Peter approached it very 2 ．
He got down on one knee, examined the elephant's 3 and found a large piece of wood deeply stuck（刺入）in 4 ．As carefully and as gently as he 5 , Peter worked the wood out with his hunting knife, 6 which the elephant carefully put down its foot．The elephant 7 to face the man, and with a rather curious look on its face, 8 at him for several tense moments．Peter stood 9 , thinking of nothing else but being killed． 10 the elephant trumpeted（高声鸣叫）loudly, turned, and walked away．Peter never forgot that elephant or the events of that day．
Twenty years 11 , Peter was walking through the Chicago Zoo with his teenaged son．As 12 approached the elephant house, one of the creatures turned and walked over to near 13 Peter and his son Cameron were 14 ．The large bull elephant stared at Peter, lifted its front foot off the 15 , then put it down．The elephant did that several times then trumpeted loudly, 16 staring at the man．
Remembering the accidental meeting in 1986, Peter could not help 17 if this was the same elephant．Peter 18 his courage, climbed over the railing, and made his way into the elephant house．He walked 19 up to the elephant and stared back in wonder．The elephant 20 again, wrapped its trunk around one of Peter's legs and threw this stupid fellow hard against the railing, killing him immediately．
Probably it wasn't the same elephant．
1．A．appeared B．seemed C．proved D．remained
2．A．quickly B．carelessly C．carefully D．pitifully
3．A．foot B．body C．tail D．head
4．A．her B．it C．them D．him
5．A．might B．could C．should D．would
6．A．with B．before C．after D．on
7．A．rushed B．turned C．walked D．stepped
8．A．stared B．watched C．noticed D．glanced
9．A．quiet B．silent C．frozen D．sad
10．A．Slowly B．Highly C．Lowly D．Finally
11．A．ago B．after C．later D．late
12．A．Peter B．Cameron C．they D．visitors
13．A．where B．when C．what D．that
14．A．sightseeing B．visiting C．walking D．standing
15．A．floor B．ground C．earth D．land
16．A．all at once B．all the while C．all the same D．all of a sudden
17．A．realizing B．feeling C．sensing D．wondering
18．A．gathered B．called C．took D．kept
19．A．round B．direct C．about D．right
20．A．shouted B．trumpeted C．whispered D．cried
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