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．The possible existence of life on other planets.B．A technical problem that astronomers can’t solve.C．Methods for building powerful new telescopes.D．The discovery of planets orbiting distant stars.
A．The possible existence of life on other planets.
B．A technical problem that astronomers can’t solve.
C．Methods for building powerful new telescopes.
D．The discovery of planets orbiting distant stars.
单项选择题
A．She does her shopping.B．She eats a lot of things.C．She drinks extra tea.D．She sleeps a great deal.
A．She does her shopping.
B．She eats a lot of things.
C．She drinks extra tea.
D．She sleeps a great deal.
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