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D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:该剧聚焦养孩话题，讲述了一对年轻父母探索幸福、创造幸福的故事。九岁的杰森在一次民俗节日上被母亲遗弃后，就在一个沉默不语独居者的森林小屋中避难。 最终，看似毫不相干的二人组成了某种意义上的家庭。猎豹惨嚎一声，往前跌去。聚焦当代新闻人的态度和抉择：《邮报》《先驱报》两家报纸互为竞争对手，前者号称“讲述世界上最骇人听闻的新闻”，后者秉承“我们的目标是追求真相”，但现实远不是喊口号，“我们并不比他们好”…The ship belongs to Huibo Company and its 23 crew members are employed by Guangzhou Ocean Shipping Company. This practice was very common in those days, when salaries in the Mainland were much lower than those in Hong Kong. After investigation, it was confirmed that all the bodies came from the missing "Changsheng" cargo ship and were all attacked to death with blunt instruments.9.18事变，东北在日军的铁蹄之下迅速沦陷。与此同时，生死不明的谢文东被送进医院，文东会躁动着要去抢人，我党情报人员水姐也暗中相助，然而谢文东看似被囚禁，实际上是国民政府暗中想拉拢谢文东，成为对抗日军特务组织的棋子，谢文东欣然同意。