There are 40 students in our class，who come from a  ________of backgrounds.
A．varietyB．mixtureC．extensionD．combination
A
本題考查名詞辨析。variety意為“多樣性，種類”，表示“他們來(lái)自不同的背景”。mixture“混合物，混合體”；extension“伸長(zhǎng)，伸展，延伸，范圍”；combination“結(jié)合，合并，配合，組合”。
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