单项选择题

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

A．It’s a problem not yet solved.
B．It’s a question difficult to answer.
C．It’s a matter that is hidden or secret.
D．It’s a legend handed down from the past.
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单项选择题
A．At gas station.B．At a bank.C．At a hospital.D．At a school.
A．At gas station.
B．At a bank.
C．At a hospital.
D．At a school.
单项选择题
A．They are smarter than human workers.B．They are more productive than human workers.C．They are very durable.D．They are easy to design.
A．They are smarter than human workers.
B．They are more productive than human workers.
C．They are very durable.
D．They are easy to design.
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