单项选择题

Passage One

A．White blood cell count.
B．Red blood cell count
C．X-ray
D．ECG
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单项选择题
A．Eight-year-olds.B．Twelve-year-olds.C．Seventeen-year-olds.D．Adults.
A．Eight-year-olds.
B．Twelve-year-olds.
C．Seventeen-year-olds.
D．Adults.
单项选择题
A．35million. B．34millionC．25millionD．20million
A．35million.
B．34million
C．25million
D．20million
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