[A]. In both, reacting molecules have to rise over the barrier between the two wells.

　　[B]. In both types of reactions, a transition is made from the bottom of one potential well to the bottom of another.

　　[C]. In both types of reactions, reacting molecules are able to go through the barrier between the two wells.

　　[D]. In neither type of reaction does the rate of a chemical reaction depend on its activation energy.

　　3. The authors attitude toward the theory of a cold prehistory of life can best be described as

　　[A]. neutral. [B]. skeptical

　　[C]. mildly positive. [D]. very supportive.

　　4. Which of the following best describes the hypothesis of Hoyle and Wickramasinghe?

　　[A]. Molecules of interstellar formaldehyde can evolve into complex organic molecules.

　　[B]. Interstellar formaldehyde can be synthesized by tunneling.

　　[C]. Cosmic rays can directly synthesize complex organic molecules.

　　[D]. The galactic clouds are the places where prebilogical evolution of compounds necessary to life occurred.

　　Vocabulary

　　1. Arrhenius equation 阿雷尼厄斯方程式

　　2. Arrhennius 18591927 瑞典理化学家。1903年获诺贝尔化学奖

　　3. quantum-mechanical effect 量子机械效应

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