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[填空题]SHANGHAI STAR is published every Tuesday and Friday. A subscription can be made at all post offices at 96 yuan (100 issues) or 8 yuan a month. A single international subscription is at $115 for 6 months and at $ 230 for one year (postage included), paid by bank transfer to:
Industrial and Commercial Bank of China
No. 2 Huashan Road, Shanghai, 20040, China
A/C No: 02253-04607839
For more information, please call 021-62484792
Shanghai Star is published (1) one week.
The rates for an international subscription are (2) for 6 months and (3) for one year.
If you like to know more subscription information, please call (4)
If you are a domestic subscription, you may pay only (5) for 100 issues.
[单项选择]About twice every century, one of the massive stars in our galaxy blows itself apart in a supernova explosion that sends massive quantities of radiation and matter into space and generates shock waves that sweep through the arms (a narrow extension of a larger area, mass, or group) of the galaxy. The shock waves heat the interstellar gas, evaporate small clouds, and compress larger ones to the point at which they collapse under their own gravity to form new stars. The general picture that has been developed for the supernova explosion and its aftermath goes something like this. Throughout its evolution, a star is much like a leaky balloon. It keeps its equilibrium figure through a balance of internal pressure against the tendency to collapse under its own weight. The pressure is generated by nuclear reactions in the core of the star which must continually supply energy to balance the energy that leaks out in the form of radiation. Eventually the nuclear fuel is exhausted, and the press
A. The Origins and Effects of Supernovas.
B. The Life and Death of Stars.
C. The Origins and Evolution of Life on the Earth.
D. The Aftermath of a Supernov
