单项选择题

At her word she stood up and walked away, stopping at the window to pull back the curtain and ________.

A．look round
B．look out
C．look up
D．look on

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单项选择题

While doing calculation for the project, the designers ________ a new solution to a geological problem.

A．fell into
B．stumbled upon
C．set out
D．discovered

单项选择题

According to the acoustics, continual exposure ________ noise of high intensity would lead to loss of hearing.

A．of
B．with
C．to
D．by

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