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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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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