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

A trim

B melt

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C drill

D slice

参考答案: C

2 The cost of elections in the United States is borne by both the government and the private sector.

A known

B fought

C exposed

D assumed

参考答案: D

3 Acknowledged as the main cause of hay fever the pollen of ragweed is very bothersome. 

A intriguing

B annoying

C potent

D significant

参考答案: B

4 They got in quite a brawl. 

A snit

B fight

C bally

D littering

参考答案: B

5 By providing legal representation, the American Civil Liberties Union works to defend citizens against breaches of their civil rights. 

A branches

B exercises

C perusals

D violations

参考答案:D

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