单项选择题

A．They keep one or more small animals at home as pets.
B．They kill animals from time to time.
C．They let animals run or fly away now and then.
D．They exchange their animals year in and year out.
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单项选择题
A．They want to stay for more days.B．The weather has kept them here.C．Yesterday they were too busy to leave.D．The story hasn’t been finished yet.
A．They want to stay for more days.
B．The weather has kept them here.
C．Yesterday they were too busy to leave.
D．The story hasn’t been finished yet.
单项选择题
A．Cars, buses, and trucks.B．Highways built outside of the city.C．Traffic lights.D．Reducing the number of buses and trucks.
A．Cars, buses, and trucks.
B．Highways built outside of the city.
C．Traffic lights.
D．Reducing the number of buses and trucks.
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