单项选择题

What is the tone of the passage

A．Humorous.
B．Indifferent.
C．Serious.
D．Anxious.
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单项选择题
According to some loud chorus, the oil price in the new era will be as low as
A．about ＄10 a barrel.
B．nearly ＄ 30 a barrel.
C．＄ 30～40 a barrel.
D．＄ 50 a barrel.
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