What does the second paragraph mainly discuss? According to the passage, new stars are formed in spiral galaxies due to______.

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问题 What does the second paragraph mainly discuss?
According to the passage, new stars are formed in spiral galaxies due to______.

选项 A、an explosion of gas
B、the compression of gas and dust
C、the combining of old stars
D、strong radio emissions

答案B

解析

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公共英语四级笔试

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