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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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单项选择题The passage indicates that, in comparision to radio waves, gamma waves ______.

A．produce louder sound
B．are less magnetic
C．do not form in the Sun's center
D．are not long

单项选择题What does the passage mainly discuss

A．The production of solar light and heat.
B．The physical and chemical nature of life.
C．The conversion of hydrogen to helium.
D．Radiation in the x-ray part of the spectrum.