单项选择题

十进制数5用631-1BCD码表示为       
A、1011 
B、0111
C、0101
D、1001

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单项选择题

During their college year, students don't grow in the aspect of ______.

A.learning to relate to family and friends in a new way
B.becoming more self-centered
C.developing new ways of grasping knowledge
D.establishing their sexual identity

单项选择题

A.1A
B.-1A
C.-5A
D.5A