单项选择题

A．Boss and secretary.
B．Doctor and patient.
C．Customer and salesman.
D．Husband and wife.
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单项选择题
A．They were created by Galileo in 1610.B．They are electrical in nature.C．They are created by nature.D．They are there for almost thousands of years.
A．They were created by Galileo in 1610.
B．They are electrical in nature.
C．They are created by nature.
D．They are there for almost thousands of years.
单项选择题
A．By doing homework.B．By knowledge from books and parents.C．By having pocket money from their parents.D．By saving what they have.
A．By doing homework.
B．By knowledge from books and parents.
C．By having pocket money from their parents.
D．By saving what they have.
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