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A Memo
To: Infomation......

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单项选择题
What do we find after the development of the laser in the 1960s
A．Industrial revolution brought surgery changed greatly.
B．Medical help became available for industrial workers.
C．The study of art went through a complete revolution.
D．Human being’s methods in surgery changed greatly.
单项选择题
The underlined word subjects (Line 1,Para. 4) refers to ______.
A．the performance tests used in the study of sleep deficit
B．special branches of knowledge that are being studied
C．people whose behavior or reactions are being studied
D．the psychological consequences of sleep deficit
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