答案:D
解析:
One of the meanings of "keen” is "acutely sensitive.” Therefore, if our sense of smell is keen or acutely sensitive, it is capable of "distinguishing thousands of chemical odors.”
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答案:D
解析:
One of the meanings of "keen” is "acutely sensitive.” Therefore, if our sense of smell is keen or acutely sensitive, it is capable of "distinguishing thousands of chemical odors.”