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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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

单项选择题

What can be inferred about the nature of the Native American literature discussed in the passage

A．It reflects historical and contemporary life in Asia.
B．Its main focus is on daily activities.
C．It is based primarily on scientific knowledge.
D．It is reshaped each time it is experience