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.
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单项选择题
A．Boss and secretary.B．Customer and salesman.C．Doctor and patient.D．Husband and wife.
A．Boss and secretary.
B．Customer and salesman.
C．Doctor and patient.
D．Husband and wife.
单项选择题
A．Because he thought the job was boring.B．Because his health got poor.C．Because he wanted to enjoy his life with his family.D．Because he wanted to realize his dreams of life after retirement.
A．Because he thought the job was boring.
B．Because his health got poor.
C．Because he wanted to enjoy his life with his family.
D．Because he wanted to realize his dreams of life after retirement.
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