单项选择题

Passage One

A．Differences between the planets in the solar system.
B．The composition of Earth and the moon.
C．Why Earth has an iron core.
D．The origin of the moon,
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significance
单项选择题
A．Decide which movie to see.B．Order his food quickly.C．Go to a latter movie.D．Go to a different movie.
A．Decide which movie to see.
B．Order his food quickly.
C．Go to a latter movie.
D．Go to a different movie.
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