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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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
单项选择题
According to the passage, why did the first people who came to North America leave their homeland
A．They were hoping to find a better climate.
B．They were seeking freedom.
C．They were following instructions given in a dream.
D．They were looking for foo
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