问题描述：
[单选]
In the area of a cold front， which of the following statements is TRUE？ ．的选项是（）？
A．Cold air mass is above warm air mass.
B．Warm air mass is above cold air mass
C．It is hard to tell which air mass is over the other one
D．Warm air mass is on the same level as cold air mass
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答案解析：无
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