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
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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．further in summer than in winter
D．more slowly than scientists previously believed
单项选择题
According to the passage; through which of the following is the energy released in the Sun pass before it becomes light
A．Electromagnetic space.
B．The solar surface.
C．The X-ray part of the spectrum.
D．Interplanetary space.
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