单项选择题


Questions 19 to 22 are based on the conversation you have just heard.

A．Tuesday.
B．Wednesday.
C．Thursday.
D．Friday.
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单项选择题
A．They were surprised at the flavors.B．They could find food they know and love.C．There was at least one Chinese restaurant in every China town.D．Americans have different foods.
A．They were surprised at the flavors.
B．They could find food they know and love.
C．There was at least one Chinese restaurant in every China town.
D．Americans have different foods.
单项选择题
Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US ______.
A．was discouraged
B．was enforced by law
C．was prohibited by law
D．was introduced
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