单项选择题

The passage indicates that, in comparison to radio waves, gamma waves ______.

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