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TOEFL listening: Why does the professor mention Cygnus X-1?

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Narrator:
Now answer the following questions. You may use your notes to help you.

1). 1.Which would be the best title for this lecture?
(A) Astronomical Phenomena
(B) The Dangerous Black Holes
(C) A Unique Feature of the Universe
(D) The Discovery of Black Holes

2). Judging from this lecture, which statement is true?
(A) Black holes are relatively large objects.
(B) Black holes produce X-rays.
(C) Black holes produce energy.
(D) Black Holes are relatively heavy objects.

3). Karl Schwartzchild''s work led to the discovery of black holes. According to the lecture, how has he been commemorated?
(A) One dimension of a black hole carries his name.
(B) Stephen Hawking credited him with the discovery.
(C) He calculated the position of the event horizon.
(D) There is a monument to him in LaPlace, France.

4). An astronomer discovers a new celestial object. Which characteristic(s) suggests that there could be a black hole nearby?
(A) The object is very bright.
(B) The object is moving faster and faster.
(C) Both A and B
(D) Neither A nor B

5). Why does the professor mention Cygnus X-1?
(A) It produces X-rays.
(B) It is probably a black hole.
(C) It has an immense mass.
(D) It''s light is bent by a black hole.

6). According to the professor, why should we not be worried about a black hole?
(A) Black holes are still theoretical.
(B) The Earth is safe from them for a while.
(C) Our Sun will not develop into a black hole.
(D) There are no black holes nearby.

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50 TOEFL lectures
50 TOEFL lectures
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