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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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
单项选择题
How many types of motors are generally used in the shaver
A．Two.
B．Three.
C．Four.
D．Not known.
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