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A．Energy conservation.
B．A new kind of transportation.
C．Strip cities.
D．Advantages of air transportation over rail roads.
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热门试题

单项选择题A．A kind of German sausage.B．A resident of Frankfurt.C．A kind of German bread.D．The name of a German town.

A．A kind of German sausage.
B．A resident of Frankfurt.
C．A kind of German bread.
D．The name of a German town.

单项选择题A．Pre-law students.B．A group of students.C．The audience.D．The faculty.

A．Pre-law students.
B．A group of students.
C．The audience.
D．The faculty.