单项选择题

The message the author transmits to us is that ______.

A．a lie detector can make a good record of nerve impulses
B．a liar benefits himself from lying, but only at the cost of others
C．it is vital for us to be truthful to each other
D．lying will be checked by more advanced lie detectors
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单项选择题
The author implies that ______.
A．the teacher should guide all discussions by revealing her own attitude
B．children's attitudes often come from those of other children
C．in some aspects of social studies a greater variety of methods can be used in the upper grades than in the lower grades
D．schools should offer the student opportunities for travel so that he can come into contact with people he would not otherwise meet
单项选择题
A statement NOT made or implied in the passage is that ______.
A．attitudes can be based on the learning of falsehoods
B．attitudes can not easily be changed by rewards and lectures
C．worthwhile attitudes may be developed in practically every subject area
D．the attitudes of elementary school-aged children are influenced primarily by the way they are treated as infants
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