单项选择题

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

A．In about 20 years.
B．As early as possible.
C．In a couple of weeks.
D．Within a week.
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单项选择题
A．Careers in environmental engineering.B．A way to improve fuel efficiency in buses.C．The causes of air pollution.D．A new fuel for buses.
A．Careers in environmental engineering.
B．A way to improve fuel efficiency in buses.
C．The causes of air pollution.
D．A new fuel for buses.
单项选择题
A．How bones continuously repair themselves.B．The chemical composition of human bones.C．Two different types of bones in the human body.D．How bones help the body move.
A．How bones continuously repair themselves.
B．The chemical composition of human bones.
C．Two different types of bones in the human body.
D．How bones help the body move.
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