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英译汉Many artists, statesmen, writers and inventors have had the same experience. They achieved prosperity because they possessed a fierce will to keep preparing and working and a passion to succeed. They attained success, not because it was easy, but because they had the will to overcome profound obstacles and to work diligently in the pursuit of their goals.

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青年创业（young entrepreneurship）是未来国家经済活力的来源。创业者的成功不但会创造财富、增加就业机会、改善大家的生活，从长远来看，对于国家更是一件好事。创业者正是让中国经济升级换代的力量。尤其是在当前，国家鼓励大众创业、万众创新。在政策上给予中小企业支持，这更加激发了年轻人的创业热情。

ContentResolver的（）方法实现了将数据发生变化的消息发送至“消息中心”。

A. insert()
B. update()
C. notifyChange()
D. delete()

自定义内容观察者时，继承的类是（）。

A. BaseObserver
B. ContentObserver
C. BasicObserver
DefaultObserver

定义一个ContentProvider过程中，需要增加匹配的uri，请问在UriMatcher.addURI(“youAuthority”,”item/”,1)语句中井号代表（）。

A. 某个字段
B. 表名
C. 匹配任意URI
D. id