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 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
单项选择题
The two scientists were quarrelling at the beginning of the story, because __________.
A．the Japanese watch was better
B．the German watch was better
C．each of them thought his own watch was better than the other's
D．both the watches were wrong
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