单项选择题

A．Impatient.
B．Modest.
C．Helpful.
D．Careful.
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单项选择题
According to the passage, the maximum intensity of sound coming from commercials______.
A．does not exceed that of programs
B．is greater than that of programs
C．varies over a large range than that of programs
D．is less than that of programs
单项选择题
The article was written to explain______.
A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar weather interactions
D．the causes affecting weather
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