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
The underlined word undergone in Line 1 is closest in meaning to ______.
A．altered
B．substituted
C．experienced
D．preserved
单项选择题
The passage probably continues with a discussion of ______.
A．the reasons craters are difficult to study
B．the different shapes
C．some features of large craters
D．some difference in the ways small and large craters were formed
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