单项选择题

According to the passage, the author's heat pump requires ______

A．no maintenance
B．very little maintenance
C．only a yearly check of controls
D．no more maintenance than an oil burner
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单项选择题
According to the passage, which of the following statements is TRUE
A．I had never mingled with tramps and beggars in my life.
B．I first became aware of the unemployment problem in 1938.
C．Young miners and cotton workers had been brought up to work.
D．Young miners could all find work if they wanted to.
单项选择题
Many modern photographers attempt to manipulate elements of photography other ______ in their photographs.
A．than light is
B．than light
C．being light
D．light
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