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

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

Which of the following is NOT true of the Native American literature discussed in the passage

A．It involves acting.
B．It has ancient origins.
C．It has a set form.
D．It expresses an inner vision.