OG8 阅读 Q45

Choice C is the best answer. The phrases "dawdling insect," "happily meanders," and "unassuming bug's encounter" are less typical of word choices made in formal, scientific writing than of those made in less formal writing modes. Therefore, the tone that these phrases establish is best described as informal.
Choices A, B, and D are incorrect because the phrases establish a tone that is informal, not academic (choice A), melodramatic (choice B), or mocking (choice D).