ENGLI-Many animals, including humans, must sleep,

D

Key Concept

Precise word choice in completing a text

Explanation

In this question, the most logically completing choice is D. This is because the passage discusses how some scientists claim that deep sleep for hours at a time leaves an animal vulnerable, implying that there must be other functions of sleep that are hard to understand from an evolutionary standpoint. Choice D reflects this idea by stating that most traits perform functions that are hard to understand from an evolutionary standpoint.

C

Key Concept

Precise word choice in completing a text

Explanation

In this question, the most logical and precise word choice to complete the text is C. This is because the passage describes how the language in Bao Phi's collection Song I Sing has a pleasant musical quality, both when performed and when printed. The word "melodic" accurately captures this idea.

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