单项选择题

The word "hence" in line 10 means ______.

A．always
B．often
C．therefore
D．seldom
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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
单项选择题
A good title for this passage is ______.
A．Getting Blood and Plasma
B．Special Blood and Colors
C．Human Blood Types
D．The Blood Bank of a Hospital
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