单项选择题

A．An X-ray camera.
B．A movie camera.
C．Photographer’s camera.
D．A television camer
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单项选择题
A．The ways of keeping food eatable for a longer time.B．The killing of bacteria.C．The invention of the refrigerator.D．The role bacteria play.
A．The ways of keeping food eatable for a longer time.
B．The killing of bacteria.
C．The invention of the refrigerator.
D．The role bacteria play.
单项选择题
A．Shoemaker.B．Blacksmith.C．Carpenter..D．Cab driver.
A．Shoemaker.
B．Blacksmith.
C．Carpenter..
D．Cab driver.
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