The passage is mainly about______. Which of the following is true, according to the passage?

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问题 The passage is mainly about______.
Which of the following is true, according to the passage?

选项 A、Current rockets are vulnerable and unstable.
B、New propulsion system has been developed.
C、People consider loser beams as a possible solution to developing new propulsion system.
D、At present, nuclear energies can be used in propulsion systems.

答案C

解析 细节题。题意为:"下列哪句是正确的?"根据文中第三段第三句(另一些人利用核能或者采用强大的激光束来研制新的推进系统),可知选项"人们将激光束作为研制推进系统的一种可能的解决方法",为正确答案。选项"目前的火箭不稳定,不堪一击"文中未提及。
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