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
According to the passage, a volcano sends out
A．boiling water.
B．boiled water.
C．melted rock.
D．melted ice.
单项选择题
When lava cools, it becomes
A．liquid.
B．water.
C．smoke.
D．hard.
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