单项选择题
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A.Children could learn by themselves.
B.Children liked what they learned.
C.Children liked to sit in the classroom.
D.Children sat in the classroom for hours.
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单项选择题
According to the passage, through which of the following does the energy released in the Sun pass be fore it becomes light
A.The x-ray part of the spectrum.
B.Electromagnetic space.
C.The solar surface.
D.Interplanetory space.
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单项选择题
It can be inferred from the passage that the Sun's light travels ______.
A.through solid objects in space
B.in many different directions
C.more slowly than scientists previously believed
D.further in summer than in winter
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