单项选择题

Which of the following is the type of scientific explanation most likely used by a molecular biologist

A．Argumentation.
B．Deduction.
C．Reduction.
D．Generalization.
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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.
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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