单项选择题

A．They were able to fly it in the air.
B．They were able to stay up in the air for half an hour and more in the machine.
C．They were able to carry travelers.
D．They were ’able to fly in mound Dayton.
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单项选择题
A．A holiday.B．Luck.C．Work..D．An accident.
A．A holiday.
B．Luck.
C．Work..
D．An accident.
单项选择题
A．The possible existence of life on other planets.B．Methods for building powerful new telescopes.C．A technical problem that astronomers can’t solve.D．The discovery of planets orbiting distant stars.
A．The possible existence of life on other planets.
B．Methods for building powerful new telescopes.
C．A technical problem that astronomers can’t solve.
D．The discovery of planets orbiting distant stars.
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