单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．15 days.
B．17 days.
C．19 days.
D．21 days.
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单项选择题
A．In the lower atmosphere.B．In the upper atmosphere.C．On the Earth.D．Near the Earth.
A．In the lower atmosphere.
B．In the upper atmosphere.
C．On the Earth.
D．Near the Earth.
单项选择题
A．Immediately.B．Towards the end of the month.C．Next month.D．Tomorrow.
A．Immediately.
B．Towards the end of the month.
C．Next month.
D．Tomorrow.
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