单项选择题

A．Blue
B．Red
C．Green
D．A dark color
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单项选择题
A．To air-condition our houseB．To generate electricityC．To heat our apartmentD．All of the above
A．To air-condition our house
B．To generate electricity
C．To heat our apartment
D．All of the above
单项选择题
A．It is expected to be a $1.3 billion industryB．It is expected to be a $1.13 billion industryC．It is expected to be a $13 billion industryD．It is expected to be a $ 3 billion industry
A．It is expected to be a $1.3 billion industry
B．It is expected to be a $1.13 billion industry
C．It is expected to be a $13 billion industry
D．It is expected to be a $ 3 billion industry
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