The author's hypothesis concerning the cold prehistory of life would be most weakened if which of the following were true? A. Cosmic rays are unlikely to trigger the formation of simple molecules. B. Tunneling occurs only in a narrow band of temperatures around zero degrees Kelvin. C. The synthesis of interstellar formaldehyde can be activated by means other than cosmic rays. D. Simple molecules can be synthesized by means of tunneling. E. Classical chemical reactions do not occur at temperatures close to absolute zero. 答案是A，解释是从原文第三段 Cosmic rays (high-energy protons and other particles) might trigger the synthesis of simple molecules 而来。 (取其相反) 但我觉得formation跟synthesis并不等价，formation指的是形成simple molecule 而synthesis指的是simple molecules互相结合後，生成的混合物 我个人觉得C比较合适，不知道有没有大神能够帮我解惑呢? :) --

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