题干
During World War II Malta managed to _____ most of Italian and German bombers by throwing up an effective anti-aircraft screen.
A：put out
B：shut out
C：come acro
D：get acro
答案(点此获取答案解析）
B
，且
，则
的值为
在其定义域上单调递减，则函数
的单调减区间是（ ）