单项选择题

A．A place for making astronomical observations.
B．An instrument used for observing stars.
C．A trait of measurement.
D．The North Star.
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单项选择题
A．The location of the computer.B．The address of the website.C．The new schedule.D．How to find a new home.
A．The location of the computer.
B．The address of the website.
C．The new schedule.
D．How to find a new home.
填空题
What is the decision of the space agency
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