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.
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单项选择题
Because American cellphone users can choose either the prepaid service or pay as you go, cellphone subscribers have increased in number.
A．Y
B．N
C．NG
单项选择题
In Line 5 Paragraph 1, criteria most probably means______.
A．standards of judgement
B．ways
C．criticism
D．characteristic
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