[单项选择]To avoid the various foolish opinions to which mankind is liable, no superhuman genius is required. A few simple rules will keep you, not from all errors, but from silly errors. 　　If the matter is one that can be settled by observation, make the observation yourself. Aristotle could have avoided the mistake of thinking that women have fewer teeth than men, by the simple device of asking Mrs. Aristotle to keep her mouth open while he counted. He did not do so because he thought he knew. Thinking that you know when in fact you don’’t is a fatal mistake, to which we are all liable. 　　Many matters, however, are less easily brought to the test of experience. If, like most of mankind, you have strong convictions on many such matters, there are ways in which you can make yourself aware of your own prejudice. If an opinion contrary to your own makes you angry, that is a sign that you subconsciously are aware of having no good reason for thinking as you do. If someone maintains that two and t
A. when they do not violate the rules of observation and imagination.
B. if they refute their opponents’’ opinions in a fairly reasonable way.
C. unless they are convinced of their unjustifiable knowledge of things.
D. until they reconcile with their opponents through imaginary dialogue

[单项选择]To avoid the various foolish opinions to which mankind is liable, no superhuman genius is required. A few simple rules will keep you, not from all errors, but from silly errors. 　　If the matter is one that can be settled by observation, make the observation yourself. Aristotle could have avoided the mistake of thinking that women have fewer teeth than men, by the simple device of asking Mrs. Aristotle to keep her mouth open while he counted. He did not do so because he thought he knew. Thinking that you know when in fact you don’’t is a fatal mistake, to which we are all liable. 　　Many matters, however, are less easily brought to the test of experience. If, like most of mankind, you have strong convictions on many such matters, there are ways in which you can make yourself aware of your own prejudice. If an opinion contrary to your own makes you angry, that is a sign that you subconsciously are aware of having no good reason for thinking as you do. If someone maintains that two and t
A. human beings, including those of genius, are liable to foolish errors.
B. people can avoid silly mistakes unless they observe common rules.
C. it needs average intelligence for us to keep away from silly opinions.
D. foolish opinions usually occur to those who rarely commit big mistakes.