单项选择题

A．Milder weather in recent years.
B．An increase in gasoline prices.
C．Construction of bicycle paths.
D．The invention of sturdy bicycles.
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单项选择题
A．To celebrate a historic flight. B．To try out eighty new balloons. C．To recruit balloonists from all over the United States. D．To determine whether hydrogen balloons are out of date.
A．To celebrate a historic flight.
B．To try out eighty new balloons.
C．To recruit balloonists from all over the United States.
D．To determine whether hydrogen balloons are out of date.
单项选择题
A．To review material covered in an earlier lecture. B．To change students’ approach to writing. C．To point out an example of good writing. D．To give an assignment for the next class.
A．To review material covered in an earlier lecture.
B．To change students’ approach to writing.
C．To point out an example of good writing.
D．To give an assignment for the next class.
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