未知题型
For this part, you are allowed 30 minutes to write a short essay entitled On Internet Celebrities. You should write at least 120 words following the outline given below.
1. 近年来出现了大量因不同原因而出名的网络名人
2．有人认为这是网络时代的进步，有人认为他们的出现是一种退步
3．你的看法
- A.
B.有人认为这是网络时代的进步，有人认为他们的出现是一种退步
C.你的看法
【参考答案】
On Internet Celebrities[1]In recent years a variety of Inte......
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未知题型
The geology of the Earth's surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and gaseous states, water is exceptionally reactive. It dissolves, transports, and precipitates many chemical compounds and is constantly modifying the face of the Earth. Evaporated from the oceans, water vapor forms clouds, some of which are transported by wind over the continents. Condensation from the clouds provides the essential agent of continental erosion: rain. Precipitated onto the ground, the water trickles down to form brooks, streams, and rivers, constituting what are called the hydrographic network. This immense polarized network channels the water toward a single receptacle: an ocean. Gravity dominates this entire step in the cycle because water tends to minimize its potential energy by running from high altitudes toward the reference point, that is, sea level. The rate at which a molecule of water passes though the cycle is not random but is a measure of the relative size of the various reservoirs. If we define residence time as the average time for awater molecule to pass through one of the three reservoirs — atmosphere, continent, and ocean — we see that the times are very different. A water molecule stays, on average, eleven days in the atmosphere, one hundred years on a continent and forty thousand years in the ocean. This last figure shows the importance of the ocean as the principal reservoir of the hydrosphere but also the rapidity of water transport on the continents. A vast chemical separation process takes places during the flow of water over the continents. Soluble ions such as calcium, sodium, potassium, and some magnesium are dissolved and transported. Insoluble ions such as aluminum, iron, and silicon stay where they are and form thethin, fertile skin of soil on which vegetation can grow. Sometimes soils are destroyed and transported mechanically during flooding. The erosion of the continents thus results from two closely linked and interdependent processes, chemical erosion and mechanical erosion. Their respective interactions and efficiency depend on different factors. The word 'modifying' in line 4 is closest in meaning toA.changingB.travelingC.describingD.destroyingThe word 'which' in line 5 refers toA.cloudsB.oceansC.continentsD.compoundsWhat determines the rate at which a molecule of water moves through the cycle, as discussed inthe third paragraph?A.The potential energy contained in waterB.The effects of atmospheric pressure on chemical compoundsC.The amounts of rainfall that fall on the continentsD.The relative size of the water storage areasThe word 'they' in line 24 refers toA.insoluble ionsB.soluble ionsC.soilsD.continents
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D.reliability -
未知题型
By the mid-nineteenth century, the term 'icebox' had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice trade grew with the growth of cities. Ice was used in hotels, taverns, and hospitals, and by some forward-looking city dealers in fresh meat, fresh fish, and butter. After the Civil War (1861-1865),as ice was used to refrigerate freight cars, it also came into household use. Even before 1880, half the ice sold in New York, Philadelphia, and Baltimore, and one-third of that sold in Boston and Chicago, went to families for their own use. This had become possible because a new household convenience, the icebox, a precursor of the modern refrigerator, had been invented. Making an efficient icebox was not as easy as we might now suppose. In the early nineteenth century, the knowledge of the physics of heat, which was essential to a science of refrigeration, was rudimentary. The commonsense notion that the best icebox was one that prevented the ice from melting was of course mistaken, for it was the melting of the ice that performed the cooling. Nevertheless, early efforts to economize ice included wrapping the ice in blankets, which kept the ice from doing its. Not until near the end of the nineteenth century did inventors achieve the delicate balance of insulation and circulation needed for an efficient icebox. But as early as 1803, an ingenious Maryland farmer, Thomas Moore, had been on the right track. He owned a farm about twenty miles outside the city of Washington, for which the village of Georgetownwas the market center. When he used an icebox of his own design to transport his butter to market, he found that customers would pass up the rapidly melting stuff in the tubs of his competitors to pay a premium price for his butter, still fresh and hard in neat, one-pound bricks.One advantage of is icebox, Moore explained, was that farmers would no longer have to travel to market at night in order to keep their produce cool. What does the passage mainly discuss?A.The influence of ice on the dietB.The development of refrigerationC.The transportation of goods to marketD.Sources of ice in the nineteenth century
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U.growing
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未知题型
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