单项选择题

A．Supermarkets provide cheaper foods.
B．There is less delay in choosing in supermarkets,
C．Food and meat are more clean and more tasty.
D．Air-conditioning is at different temperature.
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单项选择题
A．The doctor is operating on her.B．She has had an operation.C．She’ll rest at home for another couple of weeks.D．She returned to college last week.
A．The doctor is operating on her.
B．She has had an operation.
C．She’ll rest at home for another couple of weeks.
D．She returned to college last week.
填空题
S1. In what case do bettas assume various colors
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