单项选择题

The author suggests that the third most common blood type of European is （）

A．A
B．B
C．AB
D．O

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热门试题

单项选择题

A．always
B．often
C．therefore
D．seldom

单项选择题

A．Getting Blood and Plasma
B．Special Blood and Colors
C．Human Blood Types
D．The Blood Bank of a Hospital