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 

正确答案>>>

The correct answer is D

Explanation

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.”