填空题

"Accidental" discoveries seem to have made by chance but there has to be an observant person present who ______.

【参考答案】

notices what has happened and set out to find "why\
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单项选择题
A．Seven-thirty.B．Eight o’clock.C．Seven o’clock.D．Six-thirty.
A．Seven-thirty.
B．Eight o’clock.
C．Seven o’clock.
D．Six-thirty.
填空题
The solution to the problem of making the lock stitch on a sewing machine is said to have been inspired by a nightmare.
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