单项选择题

What is the main topic of the conversation

A．It’s lethal upon contact.
B．It has relatively little harmful effect.
C．It affects the sense of hearin
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A．An experience.B．A lot of questions.C．The weather
A．An experience.
B．A lot of questions.
C．The weather
单项选择题
A．140.B．50.C．90.
A．140.
B．50.
C．90.
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