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

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单项选择题

According to the second paragraph, which of the following statements is true

A．Language is as useful as music.
B．Painting is the best of all in lifting one's spirits.
C．Not everyone is given the chance of a good future.
D．To see human's bright side is a game of chance.