单项选择题


A．accident
B．incident
C．second
D．next
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单项选择题
A．allB．noC．eachD．every
A．all
B．no
C．each
D．every
单项选择题
According to the passage, which of the following is CORRECT
A．Chest models are more convenient.
B．Frostless freezers must be defrosted by hand.
C．The cool and dry spot will shorten compressor life.
D．Keep the freezer at least three-quarters full.
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