My brother will get up early tomorrow morning ___________ he must go to bed now.

A.and B.but C.so D.or

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The Blood Group Alphabet

Sometimes people lose too much blood from injuries or accidents. To save their lives, doctors must replace the lost blood. In an operation called a transfusion, doctors put blood given by healthy people into the veins（靜脈）of the sick or injured person. But they must be careful. Although all blood looks the same, there are really different types of blood. Someone getting the wrong type of blood in a transfusion may become very sick or even die.

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__________________________________________________________________________

2.How many classes do doctors group the proteins into?

__________________________________________________________________________

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__________________________________________________________________________

4.Why can people with Type O blood only receive Type O blood?

__________________________________________________________________________

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__________________________________________________________________________

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