甲数比乙数多25%，那么乙数就比甲数少20%。[ ]
正确
With trees and grass_____ about 35％ of the urban area，the city of Hefei has taken on a new look.
A．covered
B．being covered
C．to be covered
D．covering
起飞最低标准的跑道视程（RVR）小于400米时，跑道必须有（）灯。
A.跑道中线灯
B.跑道边线灯
C.接地带灯
D.跑道末端灯
