题目内容
29. Heat capacity is the amount of energy it takes __________the temperature of a substance one degree centigrade.
| A．raising | B．rising | C．to raise | D．to rise |
C
解析
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For years, the automobile industry has been testing vehicles that use hydrogen as fuel. Now, people across the United States have had a chance to see and even drive cars that get power from hydrogen fuel cells (燃料电池).
But the hydrogen fuel cell is not a new idea. The fuel cell was first invented by Sir William Grove of Britain in 1839. Since then, many different designs, have been invented. There is one place where fuel cells are a proven technology: in space. The American space agency used fuel cells in its Apollo spaceships in the twentieth century.
The most useful fuel cell for transportation purposes is the Polymer Electrolyte Membrane, or P.E.M. fuel cell. It is simple and can operate at temperatures of sixty to eighty degrees Celsius. That is much lower than other fuel cell designs. A P.E.M. fuel cell has two sides divided by a thin membrane (膜). Hydrogen gas is forced through one side where it comes in contact with a reactive material containing the metal platinum(铂). The membrane separates the electrons(电子) from the protons(质子) in the hydrogen atoms. The protons pass through it to the other side of the fuel cell. But the electrons are captured to do work; like powering a motor. Oxygen from the air is forced into the other side of the fuel cell. There, the gas meets the protons that have passed through the membrane. They combine to form water and heat. A single fuel cell does not produce a lot of electricity. But when many fuel cells are combined, they can produce enough electricity to power a vehicle. The product of the chemical reaction that powers fuel cells is water. This makes fuel cells a very clean technology.
Hydrogen fuel cell cars have been slow to develop because of many technical problems that have to be solved. For example, it is unclear how long the membranes in P.E.M. fuel cells will last. Also, fuel cells need water for their chemical reactions. They must be designed to start easily at low temperatures and in dry climates. And smaller, less costly fuel cells must be designed before they can truly take the place of gasoline engines. Now more models of fuel cell vehicles are being tested than ever before. The threat of climate change and the high cost of oil have increased interest in these vehicles that do not cause pollution.
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Title |
More Models of Hydrogen Cars Being Tested |
|
The progress of hydrogen fuel cell |
·1.________ by Sir William Grove in 1839. ·Designed 2.________ ever since. ·Used in Apollo spaceships in the twentieth century. |
|
Operating principle of P.E.M. |
·It has two sides divided by a thin membrane. ·Hydrogen gas from one side 3.________ the active metal platinum. ·The electrons are 4.________ from the protons in the hydrogen atoms. ·The protons pass through the fuel cell to the other side. ·Oxygen from the air is5.________ into the other side of the fuel cell. ·The gas meets the protons，and then water and heat are6. ________ |
|
Reasons for slow 7.___________ of hydrogen fuel cell cars |
·There are many technical problems8. ________ ·The durability of the membranes in P.E.M. fuel cells is not clear. ·They have to start easily at 9.________ temperatures and in dry climates. ·They must be smaller and less costly before 10.________ gasoline engines. |
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Celebrating sleep
World Sleep Day, observed on 21 March, was created to bring attention to the growing number of sleep problems worldwide. Sleep is a natural part of human life, but many people in the modern world ignore its importance. As a result, sleep problems are increasingly common.
In 2002, scientists at the University of Athens in Greece conducted a survey of over 35,000 people in 10 countries around the world, including China, Belgium and South Africa. Of the people that responded to the survey, 24 percent said that they did not sleep well, and based on their responses, 31.6 percent were diagnosed（诊断） with insomnia(失眠) and another 17.5 percent were diagnosed with borderline (临界状态)insomnia. In addition, 30.7 percent of survey respondents reported visiting a doctor for help with sleep problems and 11.6 per cent said that they felt very sleepy during the day.
Overall, the survey found that many people suffer the effects of poor quality sleep, some examples of which are being unable to fall asleep and waking up in the middle of the night. The main factors causing these problems are pressure from school or work and a fast pace of life, but noise pollution and light pollution also relate to sleep and contribute to poor quality sleep. The survey’s findings are particularly troubling because large numbers of people were found to have difficulty sleeping at night. The short-term effects of this are tiredness and trouble concentrating. If this happens for a long time, the risk of gaining weight and having a heart attack may increase.
There are many things you can do to improve the quality of your sleep. First, you should have regular sleep habits. Try to go to bed and wake up around the same time each day. You also need to make your bedroom a cool, dark, quiet place to sleep so that heat, light and noise do not disturb you. At night, you should also avoid things that contain caffeine, such as chocolate, coffee, tea and many soft drinks, as caffeine may keep you from sleeping.
Getting a good night’s sleep is important for everyone. By following the advice above, you can rest better at night and work better during the day.
Title: Celebrating Sleep
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Topic |
Context |
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World Sleep Day |
Due to ignorance of sleep problems, people observed Mar. 21, World Sleep Day, ____73___attention to the importance of sleep. |
|
Responses of the survey |
Of 3, 5000 people in 10 countries in the world, there were 24 percent of the people saying they didn’t sleep well. 31.6 percent were diagnosed with insomnia and another 17.5 percent were on the __74____ of sleeplessness. The percentage of the people feeling ___75___ during the day is 11.6. In additio 30.7 percent reported__76___ to a doctor for sleep problems. |
|
__71___causing sleep problems and their consequences |
Under _77____ from school or work, people may have sleep problems. A fast pace of life causes sleep problem as well. Noise and light pollution also __78_____ to poor quality sleeps. Sleepless people are more __79___ to gain weight and have a heart attack. Feeling tired and sleepy, people find it hard to ___80______ |
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___72__ to take to improve sleep quality |
Have regular sleep habits Make your bedroom cool, dark and quiet Avoid things containing caffeine |