单项选择题

SPARSE:

A． curved
B． enthusiastic
C． despicable
D． rife
E． meek
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单项选择题
The author's analogy between the mail-sorting system and chemistry would be LESS accurate if which of the following were true
A． Very few pollutants are mobile, and most are confined to only single compartments.
B． All of the perturbations of the compartments by synthetic compounds are inconsequential.
C． The vast majority of synthetically-derived compounds affect all compartments of chemistry.
D． All chemical compounds have a more or less identical effect on all kinds of chemistry.
E． Most of the compartments in chemistry have already been identified.
单项选择题
In stating that most compartments remain unidentified, furthermore, giving ample reason for scientific humility (lines 30-31) the author suggests which of the following
A． Chemists should feel daunted by the limitations of the application of their science.
B． Chemists should recognize that the future of chemistry is not likely to be much more illuminating than its past.
C． Chemists should exercise caution in creating a chemical that may affect contexts other than the one it was developed for.
D． Chemists should work hard to identify as many new chemistries as possible in order to make their science more complete.
E． Chemists should realize the need for collaboration in attempting to create chemicals less harmful to the environment.
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