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.
<上一题 目录 下一题>
热门 试题

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
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
相关试题