题目内容
Generations of Americans have been brought up to believe that a good breakfast is one of life essentials. Eating breakfast at the start of the day, we have all been told, and told again, is as necessary as putting gasoline in the family car before starting a trip.
But for many people the thought of food first in the morning is by no means a pleasure. So despite all the efforts, they still take no breakfast. During the past ten years the number of people who didn’t have breakfast, have increased by 33 percent.
For those who feel pain of guilt about not eating breakfast, however, there is some good news. Several studies in the last few years indicate that, for adults especially, there may be nothing wrong with omitting breakfast. “Going without breakfast does not affect performance,” said Arrold E. Bender, former professor of the nutrition at Queen Elizabeth College in London, “nor does giving people breakfast improve performance.”
Scientific evidence linking breakfast to better health or better performance is surprisingly not enough, and most of the recent works are about adults, not children, “The literature”, says one researcher, Dr. Erresto at the University of Texas, “is poor”.
68. For those who do not take breakfast, the good news is that _______.
A. several studies have been done in the past few years
B. not having breakfast does no harm to one’performance
C. studies have been specially on adults
D. eating little in the morning is good for health
69.“…nor does giving people breakfast improve performance” means ______.
A. anyone without breakfast does improve his performance
B. not giving people breakfast improve performance
C. having breakfast does not improve performance, either
D. people having breakfast do improve their performance
70. The word “literature” in the last sentence refers to _______.
A. poems, plays, etc. B. written works on a particular subject
C. the famous works in history D. the modern stories of America
71. What is implied but NOT stated by the author is that _______.
A. breakfast does not affect performance
B. Dr. Erresto is engaged in research work at the University of Texas
C. not eating breakfast might affect the health of children
D. Professor Bender once taught nutrition in London
68---71 BCBC
暑假作业暑假快乐练西安出版社系列答案There are two methods by which hydrogen (氢) can be used to power cars. The first way is to use hydrogen to drive the engine, in much the same way as many cars use gas. The second method is to use the reaction of hydrogen with oxygen in a battery, making the car a kind of electric one.
The dream of producing hydrogen in the car while driving along by electrolyzing（电解）water is a long way off, so we are still at the period of batteries and filling the tank with hydrogen gas. This is the difficulty for potential car users and producers. There are only sixteen hydrogen filling stations in Los Angeles and none in 99% of other cities worldwide.
Indeed, some of the big name automobile producers have pulled out of the race to put the first practical hydrogen car on the streets. Ford and GM have announced that they are pulling out in America and so has Renault in France.
However, the Japanese companies are pressing on. In fact, Honda introduced its first hydrogen fuel cell car in 1999. They are now producing second generation hydrogen car known as the FCX Clarity. Guess where they are available for sale? In only one city because of its filling stations.
Honda thinks that they could go into full-scale production of the FCX Clarity by 2020 if the world is prepared for them by then.
Then there are hydrogen-powered buses in several European cities including Amsterdam, Barcelona, Hamburg, London, Luxembourg and Madrid. Lotus, the makers of London taxis, have announced that they propose to manufacture hydrogen-powered taxis in time for the London Olympics.
So, the hydrogen vehicle is out there and the numbers will be growing fairly soon. The buses go back to their bus station, where an electrolyzing machine changes water into fuel for them to fill up on and the same will be the case for many of London’s taxis.
Unfortunately, getting fuel is not the only difficulty for the average motorist, a number of these vehicles cost about $300,000 each.
1.According to the text, hydrogen-powered buses ________.
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A．can easily be filled up with gas. |
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B．are likely to sell well in the future. |
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C．are mainly used in the United States |
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D．won’t be used in the London Olympics |
2.What does the underlined word “them” in paragraph 5 refer to?
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A．Japanese companies |
B．Hydrogen buses |
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C．The FCX Clarity |
D．Filling stations |
3.Where are hydrogen cars currently available for sale?
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A．In Barcelona |
B．In Hamburg |
C．In London |
D．In Los Angeles |
4.We can learn from the text that ________.
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A．there are sixty hydrogen filling stations all over the world |
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B．hydrogen vehicles fueled by water will be very expensive |
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C．Honda will mass-produce the FCX Clarity by 2012 |
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D．Honda produced its first hydrogen car in 1989 |