单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．12.
B．36.
C．48.
D．24.
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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
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.
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