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.

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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

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