单项选择题

A．In a spacecraft.
B．In an observatory.
C．On the moon.
D．In an astronomy class.
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单项选择题
A．Waiter and customer.B．Doctor and patient.C．Delivery boy and customer.D．Brother and sister.
A．Waiter and customer.
B．Doctor and patient.
C．Delivery boy and customer.
D．Brother and sister.
填空题
S3
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