单项选择题

A．The weather.
B．The corrosion of the river.
C．People in search of stone as building materials.
D．Bad planning.
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单项选择题
A．Differences between soccer and rugby.B．A football match between China and Britain.C．Chinese and British football fans.D．One’s favorite sport.
A．Differences between soccer and rugby.
B．A football match between China and Britain.
C．Chinese and British football fans.
D．One’s favorite sport.
填空题
When using cleaning solutions to clean your computer screens, make sure the solutions are for ______.
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