单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Synthetic fuel.
B．Solar energy.
C．Alcohol.
D．Electricity.
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单项选择题
A．Teacher and student.B．Doctor and patient.C．Manager and office worker.D．Travel agent and customer.
A．Teacher and student.
B．Doctor and patient.
C．Manager and office worker.
D．Travel agent and customer.
填空题
I
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