【题目】Thirty-five percent of the areawith trees and grass; our city looks more beautiful.
A.covers
B.are covered
C.is covered
D.cover

【答案】C
【解析】考查主谓一致与固定搭配。百分之三十五的地区被树木和草地覆盖；我们的城市看起来更美丽。be covered with…被……覆盖。百分比+名词做主语时，谓语动词的形式由百分比所指的名词的形式（可数名词或不可数名词）决定，area是 名词为单数形式。根据句子意思，area 与cover为被动关系，应用被动语态，故选择C