单选题
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
【正确答案】
A
【答案解析】
[考点] 细节题
[解析] 从文章第一段第二句得知：他们都是科学家，所以他们决定以做实验的方法来测定谁的表更好。
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