单项选择题

This passage will most probably be followed by a discussion on________.

A．substitute habits and how to find them
B．whether worry is useful to people
C．whether all people worry at one time or another
D．how to turn worry into a useful thing

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单项选择题

According to the passage, the techniques are mentioned as the way to________.

A．solve the problem of insomnia
B．distract people from worrying
C．stop the worry circle
D．seek substitute habit

单项选择题

From the passage we can conclude that________.

A．most of the worrying follows certain reasons
B．people feel very funny when they are involved in worries
C．worry will never cause any health problems
D．worry can be reduced with substitute habits