单项选择题

A．To look for a different lifestyle.
B．To enjoy themselves.
C．For adventure.
D．For education.
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单项选择题
A．They devote a lot of time to theoretical problems.B．They spend most of their time looking through telescopes.C．They are constantly analyzing data.D．They often live near observatories.
A．They devote a lot of time to theoretical problems.
B．They spend most of their time looking through telescopes.
C．They are constantly analyzing data.
D．They often live near observatories.
单项选择题
A．Father and daughter.B．Landlord and lodger.C．Husband and wife.D．Teacher and student.
A．Father and daughter.
B．Landlord and lodger.
C．Husband and wife.
D．Teacher and student.
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