A：莎士比亚戏剧久演不衰
B：北京定期举办爵士乐节
C：达·芬奇的画被大量临摹
D：贝多芬被称为“乐圣”
生活中随时都会有垃圾的产生，环境污染是不能避免的。（判断对错）
The thief who was caught stealing on the bus couldn't ______ the fact that the passenger's purse was found in his pocket.
下列属于生命现象的是（ ）
x满足什么条件时下列分式有意义：
x-22x+1﹣1x-2．
