单项选择题

The millions of calculations involved, had they been done by hand, ______ all practical value by the time they were finished.

A．could lose
B．might lose
C．would have lost
D．ought to have lost
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单项选择题
Have you a funny ______ or unusual experience that you would like to share
A．amusement
B．incident
C．accident
D．section
单项选择题
The underlined word subjects (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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