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1、2012届高考英语专题复习精选资料集（四十四）（A）请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入最恰当的单词。注意：每空格1个单词。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 h
2、ydrogen 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 spaces
3、hips 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 s
4、ides 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
5、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 e
6、lectricity. 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 p
7、roblems 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 desig
8、ned 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.Title More Models of Hydrogen Cars Being
9、TestedThe 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
10、 are (4) _ from the protons in the hydrogen atoms. The protons pass through the fuel cell to the other side. Oxygen from the air is (5) _ into the other side of the fuel cell. The gas meets the protons，and then water and heat are(6) _Reasons for slow (7) _of hydrogen fuel cell carsThere are many tec
11、hnical problems (8) _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. 1. Invented 2. differently 3. meets 4. separated 5. forced6. formed 7. deve
12、lopment 8. unsolved 9. low 10. replacing（B）请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。 注意：每个空格只填l个单词。请将答案写在答题卡上相应题号的横线上。People today are becoming increasingly aware that a proper diet is the foundation of good health. If we dont have a regular diet of proper food, we dont have the fuel to perform at our
13、 best. However, some people think not eating breakfast doesnt matter a lot, though eating it is important. Get the truth behind this common misconception and other meal frequency and timing meals. Will eating breakfast every day help me lose weight?Yes, eating the morning meal can actually help you
14、shed pounds. People who have breakfast are less likely to eat diet-busting(破坏的) junk food and are more likely to exercise later in the day, as studies show. People who skip breakfast, on the other hand, usually make up the calories and then some before days end. Researchers found that 78 percent of
15、the men and women included in the National Weight Control Registry who have maintained an average weight loss of 66 pounds for more than 5 years eat breakfast every day. Is grazing really healthier than eating three square meals a day? No. Eating many small meals throughout the day is probably not b
16、etter for you than three main meals, the traditional amounts of food for breakfast, lunch, and dinner. The idea that grazing is healthier comes from a few old studies showing that eating frequent meals throughout the day may burn more fat and lower insulin （胰岛素）levels. But later studies have found no bene
