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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单项选择题
According to Bacon, facts______.
A．are determined by observations
B．can only be understood through logical reasoning
C．have a hierarchy
D．are gathered by illiterate assistants
单项选择题
Spontaneous generation of life______.
A．was a known fact in Bacon's time
B．is verified by maggots in putrid flesh
C．is more apparent than real
D．is a speculation which has no basis in observation
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