单项选择题

A．By displaying their feelings and emotions.
B．By exchanging their views on public affairs.
C．By asking each other some personal questions.
D．By greeting each other very politely.
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填空题
People renewed their interest in natural gas as a fuel as a result of ______ of the late 1960s and early 1970s.
单项选择题
A．A class that the woman is taking.B．A job possibility.C．A chemistry assignment.D．A study that their chemistry professor did.
A．A class that the woman is taking.
B．A job possibility.
C．A chemistry assignment.
D．A study that their chemistry professor did.
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