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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单项选择题
According to the passage, energy is released in the Sun when ______.
A．helium atoms bind with each other
B．gamma radiation escapes from the spectrum
C．radiation is absorbed by helium
D．nuclei of hydrogen atoms collide
单项选择题
A smartest human mind can do mathematical problems ______ than a simple computer.
A．much slower
B．a little faster
C．much faster
D．a little slower
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