单项选择题

Specially trained dogs are being used to__________ the trapped mountain climbers in the Northwest.

A．watch over
B．keep track of
C．come up with
D．go in for
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单项选择题
They had a fierce __________ as to whether to expand their new product overseas.
A．clash
B．debate
C．disagreement
D．crash
单项选择题
Nature has__________ engineers for a long time, for things like lotus effect, to solve some engineering problems.
A．promoted
B．sparked
C．evoked
D．inspired
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