单项选择题

A．By observing the oldest stars in the universe.
B．By studying the nearest stars that can be seen.
C．By fixing the age of the oldest stars in the Galaxy.
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单项选择题
A．15 million dollars.B．50 million dollars.C． 5 million dollars.
A．15 million dollars.
B．50 million dollars.
C． 5 million dollars.
单项选择题
A．One week.B．One month. C．Two daysD．Three days.
A．One week.
B．One month.
C．Two days
D．Three days.
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