单项选择题

The relatively low income of the commercial farmers is mainly caused by ______.

A．their failure to produce enough food for sale
B．the high cost of farming
C．the competition from abroad
D．the excessive food production
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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
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.
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