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【单选题】
已知四个水果商店苹果的单价和销售额，要求计算这四个商店苹果的平均价格，应该采用（ ）A.
简单算术平均数
B.
加权算术平均数
C.
加权调和平均数
D.
几何平均数
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【单选题】Nowadays a large number of people buy ______ Christmas trees instead of real ones.
A.
false
B.
artificial
C.
synthetic
D.
manual
【简答题】______, people buy a large number of tokens at a time. This is a ______ practice here. (general)
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