【題目】There is a（n）__________ of plants in the old man's yard, such as trees, flowers and grass.

A. group

B. kind

C. amount

D. variety

【答案】D

【解析】句意：在老人的院子里，有各種各樣的植物，如樹(shù)木、花和草。a variety of各種各樣的。

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