单项选择题

A．They are boiling a cup of water.
B．They are stirring a cup of mud.
C．They are cooking sweet and sour rice.
D．They are writing down the recipe.
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单项选择题
A．People working in a large factory.B．People walking on crowded city streets.C．An everyday activity in a small town.D．A well-known historical event.
A．People working in a large factory.
B．People walking on crowded city streets.
C．An everyday activity in a small town.
D．A well-known historical event.
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