单项选择题

As can be gathered from the passage, Aristotle's theories ______ in the Middle Ages.

A．were ignored by most scholars
B．hindered scientific progress
C．were declared as heresy
D．were basis of important discoveries
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单项选择题
Which of the following is common to Roger Bacon, Francis Bacon and Descartes
A．Speculations about gunpowder, flying machines, etc.
B．Devotion to Aristotle' s theories.
C．Belief that observation and experiment are the key to understanding nature.
D．Important inventions.
单项选择题
If refrigerated, USDA eggs will remain good for ______ weeks from the date stamped.
A．four to five
B．three
C．two to three
D．six to seven
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