igators such as myself who are proposing that the galactic
clouds are the places where the prebiological evolution of
compounds necessary to life occurred.
21.The author of the passage is primarily concerned with
(A) describing how the principles of classical chem-
istry were developed
(B) initiating a debate about the kinds of chemical
reactions required for the development of life
(C) explaining how current research in chemistry may be
related to broader biological concerns
(D) reconciling opposing theories about chemical reac-
tions
(E) clarifying inherent ambiguities in the laws of clas-
sical chemistry
22.According to the passage, classical chemical reactions
and tunneling reactions are alike in which of the fol-
lowing ways?
(A) In both types of reactions, 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 neither type of reaction does the height of the
barrier between the wells remain constant.
請記住我們的域名𝐨𝐨𝐩.𝐭𝐰
(D) In neither type of reaction does the rate of a
chemical reaction depend on its activation
energy.
(E) In both types of reactions, reacting molecules are
able to go through the barrier between the two wells.
23. According to the Arrhenius equation as discussed in
the passage, which of the following statements about
chemical reactions is true?
(A) Chemical reactions are less likely to occur at tem-
peratures close to absolute zero.
(B) In some cases the rate of a chemical reaction is
related to temperature and in other cases it is
not.
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