学位英语

【导读】2013年职称英语考试将于3月30日举行，为帮助考生有效复习职称英语卫生类考试，中大职称英语考试网整理了卫生类模拟套题，希望对您通过考试有所帮助！

第二部分：阅读判断(第16～22题，每题1分，共7分)

阅读下面这篇短文，短文后列出7个句子，请根据短文的内容对每个句子做出判断。如果该句提供的是正确信息，请在答题卡上把A涂黑;如果该句提供的是错误信息，请在答题卡上把B涂黑;如果该句的信息在文章中没有提及，请在答题卡上把C涂黑。

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 (球体) .Astronomers (天文学家) think that at the center of a black hole there is a single point in space with infinite (无限的) density (稠密). This single point is called a singularity (奇点).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. Any thing 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 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 horizon (视界) only 18 miles across.

The nearest black holes would be dozens of light years away from Earth. One light year is about 6 trillion (万亿) miles. Even the most powerful telescopes could not pick out an object so small at such a great distance.

In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found, however, so black holes remain one of the mysteries of the universe.

16. Black holes are part of space.

A.Right

B.Wrong

C.Not mentioned

17. Black holes exist but are difficult to observe.

A.Right

B.Wrong

C.Not mentioned

18. The center of a black hole is empty.

A.Right

B.Wrong

C.Not mentioned

19. The attraction of two large stars leads to gravity.

A.Right

B.Wrong

C.Not mentioned

20. The sun is the heaviest star in the universe.

A.Right

B.Wrong

C.Not mentioned

21. The nearest black holes are hundreds of light years away from us.

A.Right

B.Wrong

C.Not mentioned

22. The Hubble Space Telescope helps scientists to understand the nature of the universe.

A.Right

B.Wrong

C.Not mentioned

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