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Human perspiration is odorless. However,certain bacteria on the skin ingest sebum, a component of perspiration, and after doing so excrete compounds that have an unpleasant odor. When applied to the skin,a newly developed chemical has the effect of reducing the odor. Applying the chemical does not block the secretion of sebum nor does it reduce the population of the bacteria. Therefore,the chemical probably renders odorless the compounds secreted by the bacteria.
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当前版本由 349131oyxk 更新于2024-07-17 22:25:02 感谢由 349131oyxk 对此题目的解答所做出的贡献。
人类汗液本身是无味的，但皮肤上的某些细菌摄取汗液中的皮脂，然后分泌出具有难闻气味的化合物。一种新开发的化学物质可以减少这种气味。使用这种化学物质不会阻止皮脂的分泌，也不会减少细菌的数量。因此，这种化学物质可能使细菌分泌的化合物无味化。
第1题分析：
让我们逐一解析每个选项：
a. Killing the bacteria that ingest sebum can allow other, more harmful bacteria to colonize the skin.
b. The chemical causes bacteria to change their ingestion behavior, including which substances they ingest.
c. Attempts to develop a chemical that would block the secretion of sebum have been unsuccessful.
d. The chemical does not combine or in any other way chemically react with sebum.
e. The vast majority of bacteria that inhabit the human skin do not cause unpleasant odors.
因此，正确答案是b，因为它直接挑战了化学物质减少气味效果的作用机制，即通过改变细菌的摄取行为来达到目的，而不仅仅是使其分泌的化合物无味化。
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