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"Have you ever been out on a boat and felt it lifted up by a wave? Or have you jumped in the water and felt the rush of energy as waves came over you?" asked Jamie Taylor of the Wave Energy Group at the University of Edinburgh. "There is certainly a lot of energy in waves," he said.
Scientists are working to use that energy to make electricity. Most waves are created when winds blow across the ocean. "The wind starts out by making little ripples (涟漪) , but if they keep on blowing, those ripples get bigger and bigger and turn into waves," Taylor said. " Waves are one of nature 's ways of picking up energy and then sending it off on a journey.
When waves come toward the shore, people can set up dams to block the water and send it through a large wheel called a turbine (涡轮机) . The turbine can then power an electrical generator to produce electricity.
"The resource is huge," said Janet Swain of the Worldwatch Institute. "We will never run out of wave power. " Besides, wave energy does not create the same pollution as other energy sources, such as oil or coal. Oceans cover three-quarters of the Earth's surface - that would make wave power seem ideal for creating energy throughout the world, though there are some weak points yet to overcome.
Swain said that wave power still costs too much money. She also said that its effects on sea animals are still unknown. What is more, wave power could affect fishing and boat traffic.
Traditional sources of energy like oil and gas may someday run out. " Demand for energy to power our TVs and computers, drive our cars, and heat and cool our homes is rising rapidly throughout the world," Swain said. In the future when you turn on a light, an ocean wave could be providing the electricity!
64. The writer uses the two questions at the beginning of the passage to _______.
A. test the readers' knowledge about waves B. draw the readers' attention to the topic
C. show Jamie Taylor's importance D. invite the readers to answer them
65. The underlined phrase "picking up" (paragraph 2) is closest in meaning to _______.
A. starting again B. speeding up C. gathering D. improving
66. We can make better use of wave energy if we _______.
A. shorten its journey to thousands of homes B. build more small power stations on the oceans
C. reduce the cost of turning it into electric power
D. quicken the steps of producing electricity
67. It can be inferred that some day we might not worry about ________.
A. air pollution B. our boat traffic C. our power supply D. our supply of sea fish
查看习题详情和答案>>Barcodes(条形码) aren’t given much thought by the majority of consumers, but these codes were fairly recently applied in a working fashion in 1970.
A small food store owner decided one day that keeping records of the inventory(存货) of his stock and the associated prices were an extremely laborious process, and so, in 1948, he contacted The Drexel Institute of Technology in a bid to work towards a solution. Bernard Sliver rose to the challenge and set out to study the problem and began working on a solution involving an automatic way of keeping track of items that had been sold. Sliver and a group of students from the institute realized their answer in the form of ultraviolet light (紫外线), ink and a scanner.
The system worked initially, but possessed some negatives. It was incredibly costly to carry out on a large scale and the system was also unstable. If the invention was to become commonplace(寻常的事)in grocery stores, these two problems had to be solved.
The patent (专利) for the bar code system was filed by Sliver and one of his students, Woodland. The patent was not granted immediately; in fact, it took three years for the patent agency to grant their invention patent for the barcode, occurring on 7th October, 1952.
Despite the patent being issued, the system was still not welcomed by the majority of store owners. It was not until 1966 that the system began moving its way into more and more grocery stores. This system was soon criticized, as there was no central mechanism for controlling uniformly(统一地)coded items. In 1970, Logicom developed the Universal Grocery Products Identification code( UGOIC), soon shortened to Universal Identification Number (UPC). It was Marsh’s superstore, in Troy, which was the very first store to install this complex barcode reading system, and its popularity has soared(升温) ever since, and is obviously now commonplace in all types of stores worldwide.
1.What is stressed in the second paragraph?
A.The heavy work of store owners.
B.The function of ultraviolet light, ink and a scanner.
C.The origination of barcodes.
D.Bernard Sliver’s education background.
2.Which of the following was NOT a drawback of Sliver’s system?
A.It was expensive to be applied on a large scale.
B.It was a laborious process.
C.The system was not stable.
D.It lacked a central mechanism.
3.The popularity of the barcode rose quickly after .
A.1948 B.1952 C.1966 D.1970
4.What is the purpose of the text?
A.To tell people that failure is the mother of success.
B.To praise scientists’ efforts in making people’s lives easier.
C.To describe shop owners’ opinions of barcodes.
D.To provide information about the development of barcodes.
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Has anyone noticed how, with the passage of time, one’s relationship with one’s grown-up daughters and sons becomes changed? I’ve been aware of this for some time but I’m not quite sure how to deal with it.
Take the kitchen sink for example.
Following a family get-together at my place, I walked into the kitchen to find Kate, my daughter carefully cleaning the sink.
“Don’t do that; what are you doing that for?” I said, unhappy about the hidden criticism.
“Mum,” she said, “you really ought to put your glasses on when you clean the sink. Behind the tap here was black!”
But it’s not just things like kitchen sinks. Another time Kate arrived to pick me up to lunch. She looked at me and then asked, “Mum, why do you use brown eyebrow pencil when your hair is grey?”
A sudden memory of her, aged 14, going to her first mixed party flooded back. She had come in to say goodbye. For a moment I thought she’d been an accident. Both eyes were black. I remember suggesting that perhaps a little less eye make-up might be more effective.
Now I told her, “My hair used to be brown.”
“It looks absurd.”
“Mrs. Menzies had dark eyebrows with grey hair.”
“Yes, but you’re not Mrs. Menzies, are you?” she said triumphantly, as if that proved her point.
But a recent event made me realize that something really must be done.
She had returned some for a few weeks before getting married. One evening I went out on a dinner date. By the time my companion left me at the front door, it was about 2am. As I stepped in, an angry figure in a white nightgown stopped me.
“Well, what time of night is this to be coming home?” she shouted. “Where have you been? I’ve been worried sick!”
Shades of the past come back to disturb me. But what should I do about all this? Nothing, probably. Maybe, after all, it’s only a stage young people are going through.
The daughter thought her mother didn’t clean the kitchen sink well because of her .
A.laziness B.carelessness C.unhappiness D.poor-quality glasses
From the passage we know the daughter .
A.didn’t want to help with the sink
B.didn’t like brown eyebrow pencils
C.had an accident when she went to her first party
D.shouted at her mum because she came home late
How does the mother feel after all these have happened?
A.Shocked. B.Proud. C.Envious. D.Confused.
The author writes the stories to prove that .
A.their relationship became stronger
B.their roles changed as time passed
C.her daughter very much cared about her
D.her daughter got upset as she grew up
查看习题详情和答案>>阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答题卡标号为16-25的相应位置上。
Making new friends means _1.______(put) yourself out on a limb and asking others not only to accept you, but to like you and want to be around you as well. ____2.____(fortunate), there is no magical solution ___3.___ this part of the process, so if you want to make friends, take a deep breath and jump right in!
_4.____ first step to making new friends is figuring out what is holding you back. A lot of times people _5.____ are interested in making new friends don’t know why they don’t have them already. They can’t see that _6.____ own actions are working against them.
Once you can identify(确认,确定) what is keeping you from making new friends, you need to work through these concerns. This can be painful _7._____ you will need to put yourself outside of your comfort zones to see any real differences.
The next step is to shine in these social settings so that others will leave with a positive ___8.____ (impress). If you find social situations hard, just rely on a few simple rules.
When you feel ___9.____ (confidence) that you’ve made some great new friends, get out there and celebrate with them! No matter ____10.____ you decide to do, the important thing is to celebrate your new friends and hopefully continue cultivating more.
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I received pictures of my daughter floating (漂浮) on a lake in California. Right there under the sun during the hottest time of the day, she has only her swimsuit to cover her.
When I showed it to my students, it was as if I had shown them scenes from a horror (恐怖) movie.
“But she will get dark,” they said.
“That’s what she wants,” I told them. “We think darker skin (肤色) is beautiful.”
They looked at me in disbelief. It was as if I came from the moon.
For years, American girls spend their summer trying to get as tanned (晒黑) as possible. In China, on the other hand, girls use umbrellas all year round.
What in the world is going on?
The pale skin we think looks unattractive (不漂亮) is what Asian women want. Both groups want to meet their culture’s standard (标准) of beauty.
In the US, if you can afford to go on vacation in the summer, you head for a river, a lake or a beach, where you try to get as much sun as possible. If you are rich you take a winter vacation in some sunny spot. Your winter tan shows your wealth.
In China, once upon a time, the few wealthy were the ones who didn’t have to work out in the hot sun. So the whiter the skin, the richer the woman. The folk opera performers who play these ladies wore lots of white makeup (妆容). The tradition survives to this day.
So it comes naturally that none of my students wishes to follow the Western ways in this regard.
But now I am noticing that a new business – the tanning booth (美黑店) – started up in China. I admire those brave enough to define(给…下定义)their own idea of beauty, but I do wonder what their grandmothers would have to say to them about it!
1.The students were shocked at the picture the writer showed them because ______.
A. they thought it shameful for a girl only to wear a swimsuit
B. the writer’s daughter was wearing very little while out in the sun
C. it is dangerous for a girl to be out on a lake alone
D. with the powerful sunlight the writer’s daughter would have got a suntan
2. According to the article, which kind of woman meets the American standard of beauty?
A. Women with blond hair. B. Women with a slim figure.
C. Women with tanned skin. D. Women with pale skin.
3. In the US a winter tan usually means the person _____.
A. is hard-working B. doesn’t have to work
C. has a lot of money and spare time D. is from a very poor family
4.The writer ______ the tanning booth started up in China.
A. is not interested in B. doesn’t understand
C. doesn’t like D. has mixed feelings about
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