There are 40 students in our class，who c...

There are 40 students in our class，who come from a ________of backgrounds.

A．variety

B．mixture

C．extension

D．combination

A 【解析】本题考查名词辨析。variety意为“多样性，种类”，表示“他们来自不同的背景”。mixture“混合物，混合体”；extension“伸长，伸展，延伸，范围”；combination“结合，合并，配合，组合”。

考点分析：

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