The invention of the electric telegraph gave birth to the communications industr
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The invention of the electric telegraph gave birth to the communications industry. Although Samuel B. Morse succeeded in making the invention useful in 1837, it was not until 1843 that the first important telegraph line was constructed. By 1860 more than 50,000 miles of lines connected people east of the Rockies. The following year, San Francisco was added to the network.
The national telegraph network strengthened the ties between East and West and contributed to the rapid expansion of the railroads by providing an efficient means to monitor schedules and routes. Furthermore, the extension of the telegraph, combined with the invention of the steam-driven rotary printing press by Richard
M. Hoe in 1846, revolutionized the world of journalism. Where the business of news gathering had been dependent upon the mail and on hand-operated presses, the telegraph expanded the amount of information a newspaper could supply and allowed for more timely reporting. The creating of the Associated Press as a central wire service in 1846 marked the arrival of a new era (纪元) in journalism.
71. The main topic of the passage is .
A. the history of journalism B. the origin of the national telegraph
C. how the telegraph network contributed to the expansion of railroads
D. the contributions and development of the telegraph network
72. The word "gathering" in line 11 refers to .
A. people B. information
C. objects D. substances
73. The author"s main purpose in this passage is to .
A. compare the invention of the telegraph with the invention of the steam-driven rotary press
B. propose new ways to develop the communications industry
C. show how the electric telegraph affected the communications industry
D. criticize Samuel B. Morse
74. This passage would most likely be found in a .
A. U.S. history book B. book on trains
C. science textbookD. computer magazine
75. It can be inferred from the passage that .
A. Samuel Morse did not make a significant contribution to the communications industry
B. Morse"s invention did not immediately achieve its full potential (潜力)
C. the extension of the telegraph was more important than its invention
D. journalists have the Associated Press to thank for the birth of the communications industry |
答案
小题1:D
小题2:C
小题3:A
小题4:B
小题5:B |
解析
| 略 |
举一反三
Educators and explorers Will Steger, John Stetson, Elizabeth Andre and Abby Fenton joined four Inuit hunters on a 1,200-mile, four-month-long dog-seld expedition (考察队) across the Canadian Arctic’s Baffin Island.
The expedition is travelling with four Inuit dog teams over traditional hunting paths, up frozen rivers, through steep-sided bays, over glaciers and ice caps, and across the sea ice to reach some of the most remote Inuit village of the world.
The travelers wake up early around 6 a. m . During the course of the day they are able to travel about 17 miles. They hope to be able to travel 25 miles or 30 miles per day. They manage their body temperature by adding or taking off layers depending on their level activity.
Team member Elizabeth Andre had to leave the expedition because of frostbite(冻伤) . She was disappointed to miss part of the expedition, but leaving the field was the right decision to protect her fingers from any more damage. She will rejoin the expedition in Pangnirtung, the next village. Elizabeth feels how tough the weather condition can be in the Arctic. She is beginning to appreciate how much skill and knowledge of the environment the Inuit people have.
The expedition team plan to eat a combination of country foods from Iglulik, fresh meat hunted on the trail, and dried food packed out from Steger’s homeland in Minnesota.
The expedition members have already begun to notice the effects of global warming. Theo, a native Inuit traveling with the team, points out that “Looking at what we saw today －we saw that there haven’t been caribou(驯鹿) tracks for a long time. Usually, you look out of your window in Iqaluit and you see them. Now numbers are down”. Theo was born in an igloo(冰屋)and has lived in Inuit for most of his life.
49. The main purpose of the expedition is to_______.
A. experience the hard life of Inuit
B. appreciate the beautiful environment of Inuit village
C. do some research about the Inuit’s life style
D. explore the effects of global warming
50. of the expedition team members didn"t miss any part of the expedition.
A. Four B. Six C. Seven D. Eight
51. The author gives an example of the caribou to show that_______.
A. global warming has had bad effects on the environment there
B. caribous are dying out because of the cold weather
C. the Inuit hunters have killed too many wild animals
D. good measures haven’t been taken to protect wild animals
52. From the text we can learn that_______.
A. the expedition team will walk across the Arctic
B. the expedition members only eat their packed food
C. the final stop for the expedition team is Pangnirtung
D. traveling to Inuit villages needs skill and knowledge of the environment. |
When scientists set out to explore the roots of human laughter, some apes（类人猿） were just tickled（胳肢）to help. That’s how researchers made a variety of apes and some human babies laugh. After analyzing the sounds, they concluded that people and great apes inherited laughter from a shared ancestor that lived more than 10 million years ago. Experts praised the work, it gives strong evidence that ape laughter and human laughter are related through evolution（进化）.
Scientists have noted that apes make characteristic sounds during play or while being tickled, especially to signal that they’re interested in playing. It’s been suggested before that human laughter grew out of primate（灵长类动物） roots. But ape laughter doesn’t sound like human laughter. It may be slower noisy breathing. So what does that have to do with the human ha-ha? To investigate that, Marina Davila Ross and her colleagues carried out a detailed analysis of the sounds made by tickling three human babies and 21 other primates, apes included.
After measuring 11 features in the sound from each species, they tried to find out how these sounds appeared to be related to each other. The result looked like a family tree. Significantly, that tree matched the way the species themselves are related, the scientists reported online in the journal Current Biology. They also concluded that while human laughter sounds much different from ape laughter, their typical features could have come from the same ancestor.
Panksepp, who studies laughter-like responses in animals but didn’t participate in the new work, called the paper exciting. Panksepp’s own work concludes that even rats produce laughter in response to playing and tickling, with sounds that can hardly be heard by people. Robert Provine, a scientist, who wrote the book, Laughter: A Scientific Investigation, said the new paper showed some important clues, like ape sounds that hadn’t been realized before.
69. Why did the scientists analyze the laughter made by tickling human babies and apes?
A. To try to discover if they can make characteristic sounds.
B. To see if they interested in playing.
C. To find out if the laughter of apes and humans is related.
D. To find out the differences between humans and apes.
70. Based on Paragraph 3 we can know that researchers measured the features in the sound to ________.
A. find out ape sounds that hadn’t been realized before
B. find out relations among primates’ laughter
C. see what a family tree from each species looks like
D. make a report online in the journal Current Biology
71. What can be inferred from the last paragraph?
A. Panksepp spoke highly of the new research.
B. Rat laughter is likely to be related to ape laughter.
C. Robert Provine provided some new clues for the researchers.
D. Humans don’t enjoy listening to ape laughter.
72. What would be the best title for the passage?
A. Ape study explores evolution of laughter.
B. Apes like to laugh when being tickled.
C. Human laughter and ape laughter are different.
D. Laughter: A Scientific Investigation. |
Students must apply for a place before attending any class. Applications(申请), either by post or in person, are dealt with strictly in the order they are received at the Adult Education Office.
You can apply:
BY POST-Use the card provided with the exact fee. You"ll be accepted on the course unless it is full, in which case we will inform you. An acknowledgement(承认) will not be made nor a receipt(收据) sent unless you provide a stamped addressed envelope. Receipts will normally be given out at the first class.
IN PERSON-Call at the Adult Education Office (ground floor, Block C) between approximately 9:00 a.m. and 3:00 p.m. (2:30 p.m. on Fridays), or at the College Reception Desk (at the main entrance) at the other times (in the evenings until about 7:30 p.m. on Fridays).
Students should note that popular classes may be full well before the course is to start, so that early application is strongly advised to avoid disappointment.
For the AUTUMN TERM, applications will be accepted by post (preferably) or in person from 1st August.
For the SPRING TERM, applications will be accepted from 1st December.
For the SUMMER TERM, applications will be accepted from 1st April.
68．Students who apply to the college by post will ________ .
A．avoid disappointment
B．be sent a bill
C．have an advantage over people applying in person
D．be informed if they haven"t got a place
69．Students applying by post must ________ .
A．hand in a stamped addressed envelope in person
B．pay at the first class
C．bring the receipt to the first class
D．send payment with their application
70．Where can students apply in person?
A．At the College Reception Desk at 3:30 p.m.
B．At the Adult Education Office after about 3:30 p.m.
C．At the Adult Education Office at 9:30 a.m.
D．At the College Reception Desk at 2:20 p.m. on Fridays.
71．If students want to apply for the AUTUMN TERM, ________ .
A．they should check whether the course is full
B．they can apply by post or in person
C．applications must be received by August 1st
D．they must apply in person before August 1 |
The Peppered Moth, a kind of insect, is found in England. It is light brown in color and likes to settle on trees which are also light brown. This makes the moth difficult to be seen and birds are less likely to notice and eat it.
But with the development of industry, smoke from factories began to reach the trees where the moth settled. It made the trees blacker. Then something very strange took place: in industrial areas, the Peppered Moth began to change color. It became darker as well. Although the change took several years, some scientists soon noticed that newly-born moths were a little darker than usual.
A scientist called Kettle Well decided to make a careful study of this. He marked some of the light moths and some of the darker ones, and set them free in the woods near Birmingham, an industrial city. Later he retarget as many the marked moths as possible ( The result was given in the chart ).
Kettle Well’s research was done in the early 1950s. Soon afterwards Britain introduced new laws to reduce smoke and factory pollution.
Can you imagine what would happen to the Peppered Moth as the air became cleaner again?
| light moths
| darker moths
| Moths set free
| 201
| 601
| Moths recaught
| 34 ( 16%)
| 206 ( 34%)
|
1. The trees where the Peppered Moth settled changed their color because _____________________________.
A. the Peppered Moth changed its color
B. the Peppered Moth couldn’t be easily found on them
C. industry in England developed quickly
D. the smoke from factories polluted them
2. The Peppered Moth began to change its color in industrial areas because _____________________________.
A. it changed its color all the time
B. it was fond of the color of its living place
C. it had to protect itself by doing so
D. it was a special sort of insect
3. From the results of Kettle Well’s research, we can see that _________________.
A. many more of the light moths were killed or eaten
B. more than one-fifth of the light moths escaped being killed
C. three times as many dark moths were kept safe as light ones
D. more dark moths were killed in industrial areas
4. Kettle Well’s work gives us a good example of _________________________.
A. Air Pollution B. Choice of Color C. Laws of Nature D. Changing Insects
5. As the air became cleaner, _________________________.
A. the number of the light moths increased
B. the total number of the light moths remained unchanged
C. more of the darker moths would be recaught
D. the darker moths changed into the light ones before long |
A breathtaking trick potentially left over from our ancestors might be found in us — the ability to sense oxygen through our skin.
Amphibians, animals such as frogs that can live both on land and in water, have long been known to be capable of breathing through their skin. In fact, the first known lungless frog that breathes only through its skin was discovered recently in the rivers of Borneo.
Now the same oxygen sensors found in frog skins and in the lungs of mammals (哺乳动物) have unexpectedly been discovered in the skin of mice.
“No one had ever looked,” explained Randall Johnson, a biologist researcher.
Mice and frogs are quite distant relatives, so the fact they have these molecules (分子) in common in their skin suggests they might well be found in the skin of other mammals, such as humans.
“We have no reason to think that they are not in the skin of people too,” Johnson said. These molecules not only detect oxygen, but help increase levels of vital red blood cells, which carry oxygen around the body. Normal mice breathing in air that is 10 percent oxygen—a dangerously low level similar to conditions at the top of Mount Everest, and about half that of air at sea level. However, mice that had the oxygen sensor HIF-1a genetically removed from their skin failed to produce this hormone (荷尔蒙) even after hours of such low oxygen.
These findings, if they hold true in humans, suggest one could raise the level of oxygen circulating inside the body. This could help treat lung diseases and disorders such as anemia (贫血症) without injecting drugs, which make up a multibillion-dollar market, Johnson said.
Athletes also often try to get more oxygen delivered to their muscles in order to improve their performance. They often do this by training at high altitudes or in low-oxygen tents. The new study suggests they might want to expose their skin as well as breathing in low-oxygen air to improve their performance. “It’s hard to say what exactly might be done, however—there’s a lot we don’t know yet,” Johnson explained.
The scientists detailed their findings in the April 18 issue of the journal Cell.
49. Which of the following statements is TRUE according to the passage?
A. Johnson believes that Oxygen sensors also exist in human skin.
B. People have to surf the Internet to read detailed findings.
C. It has been proved that these findings help treat lung diseases.
D. It has long been expected oxygen sensors exist in mice’s skin.
50. One of the functions of the molecules mentioned above is _______.
A. carrying oxygen around the body B. improving athletes’ performance
C. detecting oxygen D. increasing level of oxygen
51. What is Johnson’s attitude to the application of the findings to the athletes’ training?
A. Negative B. Doubting C. Positive D. Hesitating
52. The best title of the passage may be _______.
A. Great Findings Benefits Athletes A Lot
B. Frogs And Mice Are Distant Relatives
C. First Known Animal Breathes Through Skin
D. Humans Might Sense Oxygen Through Skin |
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