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
According to the passage, the maria differ from the terrace mainly in terms of ______.
A．age
B．manner of creation
C．size
D．composition
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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