单项选择题

What kind of a plane was it that crashed

A．A war plane.
B．A freight plane.
C．An ordinary plane.
D．A float plane.
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单项选择题
According to the passage lunar researchers have focused mostly on ______.
A．the possibility of finding water on the Moon
B．the lunar regolith
C．cataloging various land formations
D．craters and their origins
单项选择题
According to the passage, the maria differ from the terrace mainly in terms of ______.
A．age
B．manner of creation
C．size
D．composition
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