单项选择题

下列有关随机误差的叙述正确的是（ ）。

A．随机误差会重复出现
B．随机误差有时偏大，有时偏小
C．随机误差具有单向性
D．随机误差是可以测定出来的
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We conclude that the prices of CDs are higher in Wal-Mart because __________.
A．we had the experience of buying expensive CDs here
B．one CD is 10 yuan higher in price than in another store
C．prices are normally higher here than in other stores
D．we observed a few instances of higher prices of CDs here
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