某火炮厂发生爆炸事故，造成39人死亡，49人受伤。该火炮厂是村办集体企业，由村民陈某任厂长，实行承包经营，实际上是由陈某与村民杨某合伙生产经营。后因经营亏损，陈某向杨某提出不再合伙经营，杨某同意，并提出修改合同，在合同上明确杨某也是承包人。于是，二人找到村领导，村领导明确表态，对杨某要求经营火炮厂的要求给予否定，理由是杨某没有这方面的技术和职称，不能让其办分厂。
但陈、杨二人私下商定以一个厂的名义，分成两组各自独立生产经营，自负盈亏，在未经任何部门、任何人检查验收的情况下，将厂房分为两部分，进行生产。由于厂房分割后，空间狭小，厂房内切引、插引等危险工序与封底、封面、编序等一般工序混于同一厂棚内。当时，农忙季节已过，要求来厂干活的村民很多，陈、杨二人将主要精力放在对外业务上，陈将厂内工作安排事宜交由其妻主管，杨则将工作安排事宜交由其女负责。
这二人都是一般农家妇女，未经过专门培训学习。开始二人还简单地给新来工人强调火炮安全生产的一般常识，然后安排上岗，后来连简单的要求都不强调就安排工人上岗。事故发生当天，切引工龙某在工作台上垫上木板，用菜刀将引线切成小把，供插引工领去插引。因当时来做工的人较多，切好的引线不够用，龙某就用另一名工人切过油蜡纸的菜刀和垫板，肩上搭着引线，在工棚内、插引区来回走动，随意切引线，当龙某在工棚南段东端切引线时，发生燃烧，引起待插引火炮发生爆炸，导致事故发生。
根据以上场景，回答下列问题：
Passage Three
The old fashioned general store is fast disappearing. This is, perhaps, a pity, because shopping today seems to lack that personal element which existed when the shopkeeper knew all his regular customers personally. He could, for instance, remember which brand of tea Mrs. Smith usually bought or what sort of washing powder Mrs. Jones preferred. Not only was the shop a center of buying and selling, but a social meeting place.
A prosperous general store might have employed four or five assistants, and so there were very few problems in management as far as the staff was concerned. But now that the supermarket has replaced the general store, the job of the manager has changed completely. The modem supermarket manager has to cope with a staff of as many as a hundred, apart fi’om all the other everyday problems of running a large business.
Every morning the manager must, like the commander of an army division, carry out an inspection of his store to make sure that everything is ready for the business Of the day. He must see that everything is running smoothly. He will have to give advice and make decisions as problems arise; and he must know how to get his huge staff to work efficiently with their respective responsibilities. No matter what he has to do throughout the day, however, the supermarket manager must be ready for any emergency that may arise. They say in the trade that you are not really an experienced supermarket manager until you have dealt with a flood, a fire, a birth and a death in your store.
根据以上场景，回答下列问题：Passage ThreeThe main purpose of the passage is to show ______