单项选择题

A．They are on business.
B．They are working.
C．They are on holiday.
D．They have a rest at home.
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单项选择题
A．To explain why things happen.B．To explain how things happen.C．To describe self-evident principles.D．To support Aristotelian science.
A．To explain why things happen.
B．To explain how things happen.
C．To describe self-evident principles.
D．To support Aristotelian science.
单项选择题
A．Renewing passport.B．Brushing her apartment.C．Buying plane tickets.D．Going to the travel agency.
A．Renewing passport.
B．Brushing her apartment.
C．Buying plane tickets.
D．Going to the travel agency.
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