每日一题

Critical Reading>Sentence Completions

Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.

Scientists have discovered that our sense of smell is surprisingly ------- , capable of distinguishing thousands of chemical odors.

(A) rigid
(B) inert
(C) erratic
(D) keen
(E) innate

答案和解析

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."