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.
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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.
单项选择题
A．She is waiting for the man.B．She is waiting for her mother.C．She is waiting for a bus.D．She is waiting for it to stop raining.
A．She is waiting for the man.
B．She is waiting for her mother.
C．She is waiting for a bus.
D．She is waiting for it to stop raining.
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