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
What is the author's attitude toward Native American literature
A．Admiring of its form.
B．Critical of the cost of its production.
C．Amused by its content.
D．Skeptical about its origins.
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