单项选择题

Laser beams can be used to bore metals and other hard materials.

A．trim
B．melt
C．drill
D．slice
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单项选择题
People fishing on a lake must wait calmly so as not to scare the fish away.
A．considerately
B．hungrily
C．alertly
D．quietly
单项选择题
Acknowledged as the main cause of hay fever the pollen of ragweed is very bothersome.
A．intriguing
B．annoying
C．potent
D．significant
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