单项选择题

The passage specifically states that ______.

A．direct experiences are more valuable than indirect ones
B．whatever attitudes a child learns in school have already been introduced at home
C．teachers can sometimes have an unwholesome influence, on children
D．most children fear policemen

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单项选择题

In the author's opinion, ______.

A．physiological changes will for sure betray a liar
B．the bigger a lie is, the stronger the strain will be
C．the degree of the strain depends on the purpose of lying
D．a well-trained person can tell lies without being detected

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