退耕还林还草的目的是__________生态环境。
保护和改善
烧伤最常见的并发症是:()。
A.周身感染
B.呼吸衰竭
C.休克
D.急性肾功衰竭
E.应激性溃疡
He was very rude to the Customs officer, _____ of course made things even worse.
A.who
B.whom
C.that
D.which