单项选择题

A．To air-condition our house
B．To generate electricity
C．To heat our apartment
D．All of the above
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单项选择题
A．Failing in schoolB．Failing to make the teamC．Failing several coursesD．Being a dropout
A．Failing in school
B．Failing to make the team
C．Failing several courses
D．Being a dropout
单项选择题
A．ThreeB．OneC．TwoD．Four
A．Three
B．One
C．Two
D．Four
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