单项选择题

A．Synthetic fuel.
B．Solar energy.
C．Alcohol.
D．Electricity.
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单项选择题
A．Boss and employee.B．Teacher and student.C．Passersby.D．Father and daughter.
A．Boss and employee.
B．Teacher and student.
C．Passersby.
D．Father and daughter.
单项选择题
A．He has been to Seattle many times.B．He has chaired a lot of conferences.C．He has a high position in his company.D．He lived in Seattle for many years.
A．He has been to Seattle many times.
B．He has chaired a lot of conferences.
C．He has a high position in his company.
D．He lived in Seattle for many years.
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