单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What did some scientists try to explain by suggesting that stars repel each other

A．Why stars move so quickly.
B．Why few stars have planets.
C．Why stars aren’t moving toward one another.
D．Why stars haven’t moved farther apart.

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单项选择题

单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What did some scientists try to explain by suggesting that stars repel each other 您的浏览器不支持 audio 元素。