17 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.

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

　　22 In 1994 the Hubble Space Telescopeprovided 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

　　分析：意思是：黑洞是空间的一部分。通过我们对于整篇文章的理解，尤其是第一段前两句话的理解，自然可以判断这种说法是真确的，因此选A。

　　17. Black holes exist but are difficult to observe.

　　A. Right B. Wrong C. Not mentioned

　　分析：意思是黑洞存在者但难以被人们观察到。关于这一题，我们从文章能找到几乎一模一样的句子：Although black holes do exist, they are difficult to observe.因此断定答案为A。

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