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单选题
A sidereal day is shorter than a solar day. This difference is due to（）.
A
irregularities in the daily rotational rate of the Sun
B
the space motion of the solar system
C
the precession of the equinoxes
D
the use of different reference points
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单选题A sweep oar is an oar that is（）.A
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is raised in the bow of the boat for the steersman to steer byD
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They make bread.C
They sell clothes for Mother’s Day and Father’s Day.
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