[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

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[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. about twice each year
B. hundreds of times each century
C. about once every fifty years
D. about once every other century

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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 su
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 Supernova.

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About one million tourists go to Barcelona every year, just to visit the Gaudi’s Church. This unusual church has a strange history. Gaudi was born in Spain in 1852. He had to work and study at the same time. He often missed classes because he had to work, but one day he designed a very unusual show-case for an exhibition in Paris. People began to give him work. He designed houses, offices and gardens. They were all very unusual. He was soon rich and famous. Then a rich bookseller said, "Will you build a church for the poor people of Barcelona I will pay. I will build schools and workshops, too. They will help the people." "I will do it," said Guadi. He worked for forty years, but he could not finish the church. It was too big. He needed $10, 000, 000. He gave all his money to the church. He was poor again when he died in 1926, and only the front
A. Barcelona--A Famous City
B. Strange History of Unusual Church
C. A Poor Architect’s Study
D. Gandi’s Life in His Childhood

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[单项选择]About one million tourists go to Barcelona every year, just to visit the Gaudi’s Church. This unusual church has a strange history. Gandi was born in Spain in 1852. He had to work and study at the same time. He often missed classes because he bad to work, but one day he designed a very unusual show-case for an exhibition in Paris. People began to give him work. He designed houses, offices and gardens. They were all very uhusual. He was soon rich and famous. Then a rich bookseller said, "Will you build a church for the poor people of Barcelona I will pay. I will build schools and workshops, too. They will help the people." "I will do it," said Guadi. He worked for forty years, but he could not finish the church. It was ton big. He needed ＄10, 000, 000. He gave all his money to the church. He was poor again when he died in 1926, and only the front part of the church was finished. Now, architects, engineers and tourists from all over the world like to come and see the church, which is ver
A. Bareelona--A Famous City
B. Strange History of Unusual Church
C. A Poor Architect’s Study
D. Gaudi’s Life in His Childhood

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