单项选择题

Children mustn’ t play with matches because （）

A．matches bum paper
B．it isn’ t interesting
C．they can be dangerous
D．they can bum a house

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单项选择题

Which of the following is not the result of burning garbage（）

A．The garbage burned is turned into fossil fuels.
B．The heat produced is used to boil water.
C．The steam produced is used to make electricity.
D．The steam produced is used to heat buildings.

单项选择题

57（）

A．music
B．song
C．melody
D．style