单项选择题

A．伏枝堇菜
B．三色堇
C．紫花地丁
D．荠菜

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单项选择题

In chapter 5, according to Professor Hansen's bell-shaped curve of average temperature, what does three standard deviations mean for temperature?

A．Moderate heat or cold that occurs regularly
B．Extreme heat or cold that occurs a couple of times in a thousand occurrences
C．Slight heat or cold that occurs in twelve times in a thousand occurrences
D．Normal heat that occurs normally

单项选择题