求教36套上的一道阅读题

水滴石穿kUID: 3250053

Ex32 第5题
About a century ago, the Swedish physical scientist Arrhenius proposed a law of classical chemistry that relates chemical reaction rate to temperature. According to the Arrhenius equation, chemical reaction are increasingly unlikely to occur as temperatures approach absolute zero, and at absolute zero (zero degrees Kelvin, or minus 273 degrees Celsius) reactions stop. However, recent experimental evidence reveals that although the Arrhenius equation is generally accurate in describing the kind of chemical reaction that occurs at relatively high temperatures, at temperatures closer to zero a quantum- mechanical effect known as tunneling comes into play; this effect accounts for chemical reactions that are forbidden by the principles of classical chemistry. Specifically, entire molecules can "tunnel" through the barriers of repulsive forces from other molecules and chemically react even though these molecules do not have sufficient energy, according to classical chemistry, to overcome the repulsive barrier.
The rate of any chemical reaction, regardless of the temperature at which it takes place, usually depends on a very important characteristic known as its activation energy. Any molecule can be imagined to reside at the bottom of a so-called potential well of energy. A chemical reaction corresponds to the transition of a molecule from the bottom of one potential well to the bottom of another. In classical chemistry, such a transition can be accomplished only by going over the potential barrier between the wells, the height of which remains constant and is called the activation energy of the reaction. In tunneling, the reacting molecules tunnel from the bottom of one to the bottom of another well without having to rise over the barrier between the two wells. Recently researchers have developed the concept of tunneling temperature: the temperature below which tunneling transitions greatly outnumber Arrhenius transitions, and classical mechanics gives way to its quantum counterpart.

5.Which of the following best describes the organization
of the first two paragraphs of the passage?
(A) The author cites a basic principle of classical
chemistry and then describes the research from
which that principle was developed.
(B) The author cites an apparent contradiction to
the principles of classical chemistry and then
explains the process of a chemical reaction to
show there is in fact no contradiction.
(C) the author describes the role of heat in chemical
reactions and then offers a detailed explanation
of its function.
(D) The author presents a law of classical chemistry in
order to introduce a kind of chemical reaction
that differs from it and then explains the essential
difference between the two.
(E) The author presents the fundamental rules of classical
chemistry in order to introduce an explanation of a
specific chemical reaction.
答案是D，但我觉得D和E都可以啊，不知有什么区分，做过的同学指导一下我吧，谢谢啦~

jyfishUID: 3227272

问题是前两段的的大致意思，第一段由老观点引出新观点，第二段解释之间的不同，故D最好
E的问题是没有强调两者的不同吧，而且也没有说introduce后的explanation是和原来的不同。。。

水滴石穿kUID: 3250053

2# jyfish
嗯，明白了，谢谢啦~