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
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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
单项选择题
_______ was a planted sapling of the American redwood tree.
A．There is one of the gifts
B．One of the gifts that
C．That one of the gifts
D．One of the gifts
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