考点3: 细节信息的查找和确认
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20. The sun is the heaviest star in the universe.
A. Right B. Wrong C. Not mentioned
C.解析:问题句说太阳是宇宙中最重的恒星, 从句意上判断该题内容涉及文章中的细节信息, 属于细节信息题。 利用问题句中的特征词作为答案线索, 在文章中查找答案相关句:
Black Holes
Most scientists agree that black holes exist but are nearly impossible to locate. A black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere .Astronomersthink that at the center of a black hole there is a single point in space with infinitedensity.This single point is called a singularity .If the singularity theory is correct, it means that when a massive star collapses, all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all, but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity.
Although black holes do exist, they are difficult to observe. These are the reasons.
No light or anything else comes out of black holes. As a result, they are invisible to a telescope.
In astronomical terms, black holes are truly. For example, a black hole formed by the collapse of a giant star would have an event horizononly 18 miles across.
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