单项选择题


A．been used to
B．used to
C．been used for
D．used for
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单项选择题
What is the talk mainly about'
A．Advantages of the North in the Civil War.
B．Civilian opposition to the Civil War.
C．Reasons to justify fighting the Civil War.
D．Military strategy used in the Civil War.,'
单项选择题
What is the talk mainly about
A．Differences between the planets in the solar system.
B．Methods of determining the composition of Earth and the Moon.
C．Why Earth has an iron core.
D．The origin of the Moon.
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