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
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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.
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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