单项选择题

Among the infected patients by SARS, which of the following is most

A．Students.
B．Doctors and nurses.
C．Workers.
D．Officials.
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单项选择题
After putting the Japanese watch in water for 20 minutes, two scientists found ______.
A．it was a good watch
B．it went forward
C．it went faster than the German one
D．it went backwards 120 minutes
单项选择题
They did an experiment because they ______.
A．wanted to know whose watch was better
B．liked their lab
C．wanted to repair their watches
D．had a basin of water in their lab
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