单项选择题

A family with 2 adults and '2 children and with clothes washer and dishwasher should purchase a water heater with a capacity of ______ gallon.

A．66
B．52
C．80 (two tanks with 40 each)
D．82
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单项选择题
This article is mostly likely taken out of______.
A．a textbook intended for technicians
B．a consumer guide
C．a book on the history of electric appliances
D．an operation manual for a type of water heater
单项选择题
This passage is primarily concerned with______.
A．the history of Jazz
B．the themes of pop music
C．the varieties of world music
D．the importance of music in everyday life
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