单项选择题

The writer's attitude towards laughter is

A．critical.
B．doubtful.
C．positive.
D．negative.
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单项选择题
Which of the following statements is NOT true of laughter, according to the passage
A．It reduces pain.
B．It exercises the body.
C．It improves the body's immune system.
D．It can cure cancer.
单项选择题
What will take place in the next few years, according to the president
A．A big change in technologies and in the way of thinking.
B．A change in digitalisation.
C．A change in the way of manufacturing.
D．A change in the business cycle.
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