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
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单项选择题
What does the passage mainly discuss
A．What astronomers learned from the Surveyor and Apollo space missions.
B．Characteristics of the major terrains of the Moon
C．The origin of the Moon's craters.
D．Techniques used to catalogue the Moon's land forms.
单项选择题
The underlined word undergone in Line 1 is closest in meaning to ______.
A．altered
B．substituted
C．experienced
D．preserved
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