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  3. The temperature of the sun is over 5,000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees

The temperature of the sun is over 5,000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees

admin2012-08-21  22
问题     The temperature of the sun is over 5,000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees at the center. The sun is so much hotter than the Earth that matter can exist only as a gas, except at the core. In the core of the sun, the pressures are so great against the gases that, despite the high temperature, there may be a small solid core. However, no one really knows, since the center of the Sun can never be directly observed.
    Solar astronomers do know that the Sun is divided into five layers or zones. Starting at the outside and going down into the Sun, the zones are the corona, chromosphere, photosphere, convection and the sun has no solid surface, so it is hard to tell where the atmosphere ends and the main body of the Sun begins.
    The sun’s outermost layer begins about 10,000 miles above the visible surface and goes outward for millions of miles. This is the only part of the sun that can be seen during an e-clipse such as the one in February 1979. At any other time, the corona can be seen only when special instruments are used on cameras and other time, the corona can be seen only when special instruments are used on cameras and telescopes to shot out glare of the sun’s rays.
    The corona is a brilliant, pearly white, filmy light, about as bright as the full Moon. Its beautiful rays are a sensational sight during an eclipse. The corona’s rays flash out in a bril-liant fan that has wispy(纤细的) spike like rays near the sun’s north and south poles. The corona is thickest at the sun’s equator.
    The corona rays are made up of gases streaming outward at tremendous speeds and reaching a temperature of more than 2 million degrees Fahrenheit. The rays of gas thin out as they reach the space around the planets. By the time the sun’s corona rays reach the Earth, they are weak and invisible.
It can be inferred from the passage that a clear view of the Sun’s outer layer is usually prevented by______.
选项 A、the Sun’s rays
B、an eclipse
C、lack of light
D、the great distance
答案A
解析 本题属推理题，要求推测清晰观察太阳的最大障碍。同样在第三段的最后一句话，提到了四项选择中，唯D项从常识角度讲，能起到不大的干扰作用，其余均不能构成选择干扰。E
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