单项选择题

From para. 7 we may draw the conclusion that______.

A．your blood type is not decided by your red cells
B．your blood type is decided by the antigens in your red cells
C．your blood type is decided by the A, B or AB antigens
D．your blood type is decided by the different kind of serum
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单项选择题
Why are many churches called tinder-box
A．Because they are like boxes
B．For they are made from wood
C．Because they are black churches
D．For they are located on country roads
单项选择题
In para. 4 the author uses an example to show______.
A．what a low concentration of oxygen-carrying red cells will do
B．the serious consequence of imbalance of the blood
C．how a low concentration of white cells reduce the body' s ability to fight infection
D．how the red cells to carry oxygen to every part of body
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