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.,'

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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.

单项选择题

A chief factor in bringing down the births in Europe in the 19th century is

A．birth control
B．the desire to seek fortune in cities
C．the instability of marriage
D．the changed place of women