单项选择题

23（）

A．problem
B．conflict
C．contribution
D．work

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单项选择题
People with type A blood cart receive()

A．AB
B．B
C．O
D．None of the above
单项选择题
Where did the name Mark Twain come from()

A．It came from a safe passage.
B．It came from a term used by the boatmen.
C．It came from his boyhood.
D．It came from his measuring tool.
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