D. Gamma-ray bursts occur when a star is going round the sun. Ks5u

　　52. The underlined word “collapse” in the last paragraph but one probably means _____. Ks5u

　　A. fall down

　　B. break out

　　C. become unconscious

　　D. become weak K

　　53. The reason why we can’t directly study gamma-ray bursts from Earth is except that _____. Ks5u

　　A. The explosion is too far from us. Ks5uB. Our atmosphere blocks the view. Ks5u

　　C. We don’t have as advanced instruments as scientists do. Ks5u

　　D. The explosion lasts only a second. Ks5u

　　54. It can be inferred from the passage that _____. Ks5u

　　A. More research in space remains to be done. Ks5u

　　B. We have observed gamma-ray bursts by satellites for more than 50 years. Ks5u

　　C. The gravity of a black hole is so strong that even light can’t escape from it. Ks5u

　　D. We have known gamma-ray bursts quiet well, so they are not mysteries of space any longer. Ks5u

　　55. Which of the following would be the best title for the text? Ks5u

　　A. Watching Gamma-ray Bursts

　　B. Watching Black Holes Ks5u

　　C. Watching Deep-space Fireworks

　　D. Watching the Universe Ks5u

　　Ks5u

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