单项选择题

A group of scientists demanded that the federal government ____ all the studies it has founded on cloning.

A． reveal
B．revealed
C．is revealing
D．must reveal
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单项选择题
Most scientists agree _______ was hot for at least a time.
A．some of the moon that
B．some of the moon it
C．that some of the moon
D． while some of the moon
单项选择题
An air ship _______ by energy from the sun has been suggested.
A． powering
B． to power
C．is powered
D．powered
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