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
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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
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
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