free radical of ixygen,which common by-products of metabolic processes in the body,are capable of causing tissue damage.
答案是A,为什么呢?
the first city in the united states that put into effect major plan for the clustering of government buildings was washington,D.C
答案B,为什么
举报
1,which common->which are common
2,put into an effect major plan
1.which is common
2.plans
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