单项选择题

The underlined word "manual" in the third paragraph means ______.

A．man-made
B．automatic
C．using hands
D．everlasting
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单项选择题
Which is NOT the difference between upright model freezer and chest model freezer
A．An upright model takes less room on the ground.
B．An upright freezer is easier for people to put in and take out food.
C．A chest freezer is more effective than an upright one.
D．A chest model need manual defrost while an upright one needn't.
单项选择题
Which is NOT mentioned about the factors which can influence the life span of freezers
A．Humidity.
B．Proper care.
C．The amount of storage.
D．Surrounding temperatur
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