单项选择题


A．While
B．Since
C．Because
D．Suppose
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单项选择题
A．percentageB．proportionC．rateD．ratio
A．percentage
B．proportion
C．rate
D．ratio
单项选择题
A．addingB．includingC．consistingD．containing
A．adding
B．including
C．consisting
D．containing
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