用ARE
分析：分数/百分数+ of + 名词”作主语时,谓语动词的数要与of后面的名词保持一致。也就是谓语动词的数取决于of后的名词或者代词的数；若名词或代词是复数，谓语动词用复数，若名词或代词是单数，则谓语动词用单数。
例子：
Three-thirds of the surface of the earth is sea.
Tens of tons of waste goes into the air with the smoke every day.
Two-fifths of the land in that district is covered with trees and grass.
More than ten percent of the workers are from Paris.
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