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单项选择题
A．A man w. ho is courageous.B．A man who knows his faults.C．A man who knows his weakness.D．A man who has a clear knowledge of himself.
A．A man w. ho is courageous.
B．A man who knows his faults.
C．A man who knows his weakness.
D．A man who has a clear knowledge of himself.
单项选择题
A．To measure amounts of rainfall.B．To cheek the accuracy of scales.C．To observe changes in the atmosphere.D．To calculate the density of other metals.
A．To measure amounts of rainfall.
B．To cheek the accuracy of scales.
C．To observe changes in the atmosphere.
D．To calculate the density of other metals.
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