填空题

How does the betta breathe air

【参考答案】

The betta has to rise to the surface for air.
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填空题
In what case do bettas assume various colors
单项选择题
A．In the 16th century.B．In the 17th century.C．In the 18th century.D．During the Middle-ages.
A．In the 16th century.
B．In the 17th century.
C．In the 18th century.
D．During the Middle-ages.
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