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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单项选择题
After they did the experiments, they found _________.
A．both their watches were good
B．neither of their watches could tell the correct time
C．there was something wrong with the German watch
D．there was nothing wrong with the Japanese watch
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 Swiss one
D．it went backwards 120 minutes
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