单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．Six.
B．Seven.
C．Five.
D．Six or seven.
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填空题
According to the passage, when did Herakleion and Eastern Canopus disappear
单项选择题
A．One month.B．One month and a half.C．Two months.D．Two months and a half.
A．One month.
B．One month and a half.
C．Two months.
D．Two months and a half.
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