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
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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