2. 外语
  3. A black hole is an astronomical body Awhose gravity is so strong that nothing can escape from it. It was Newton Bwho first state

A black hole is an astronomical body Awhose gravity is so strong that nothing can escape from it. It was Newton Bwho first state

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问题 A black hole is an astronomical body Awhose gravity is so strong that nothing can escape from it. It was Newton Bwho first stated that light Cis composed of particles. The French mathematician De Laplace next reasoned that if enough mass Dwas added to a star like the sun, the gravitational force of the star would eventually prevent light particles from leaving it; it would therefore "blink out" and become an invisible black star.
选项
答案D
解析 本题考查的是虚拟语气的用法，法国数学家解释的理由是假设的，与事实相反，用if引导虚拟语气的句子，所以此句要把was改成were来表达虚拟语气。句意是，黑洞是一个天体，它的引力很强大以至于没有任何东西可以逃脱黑洞的吸引。牛顿是第一个声明光是由粒子组成的。法国数学家De Laplace解释说，如果把足够的质量加到恒星上，如太阳，那么恒星的引力最终会使光粒子无法脱离恒星，从而变成一个看不见的黑色星球。所以正确答案是D选项。
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