单项选择题

A good title for this passage is （）

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

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单项选择题
Which position is best for Margaret Lillian who is 21 years old and would like a part time position to help her pay her university expenses She can only work in the evenings.（）

A. 1
B. 2
C. 3
D. 4
单项选择题
Who were the earliest people living in North America（）

A. The Spanish.
B. The English.
C. The Negroes.
D. The Indians.
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