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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单项选择题
The cost of elections in the United States is borneby both the government and the private sector.
A．known
B．fought
C．exposed
D．assumed
单项选择题
Laser beams can be used to boremetals and other hard materials.
A．trim
B．melt
C．drill
D．slice
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