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.
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单项选择题
The writer's attitude towards laughter is
A．critical.
B．doubtful.
C．positive.
D．negative.
单项选择题
According to the passage, a volcano sends out
A．boiling water.
B．boiled water.
C．melted rock.
D．melted ice.
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