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    When the man's wife died,their youngest baby was 2 years old.They had six other children一three boys and three girls.aged from 4 t0 16.

    The man's parents and his wife's parents came to visit them.

    ‘‘We've been talking about how to make this work,”they said.“There's no way you can take care of all these children and work to make a living.So,we've decided to place each child with a different uncle and aunt.”

     The man refused.Over the next few weeks,he moved the family to a tiny town and his business developed quickly.People came from far away to do business with him.And the children helped him both at home and at work.

The children grew up and got married.Five of the seven went off to college.The children's success was a source of pride to the father.

    Finally,the youngest daughter,who was 2 years old when the mother died,got married.With his life's work done,the father died.

This man's work had been the lonely but joyful task of raising his family.This man was my father.I was the 1 6-year-old,the oldest of seven.

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阅读文段,回答问题。

    在过去的9年里,科学家们一直对6500万年前恐龙灭绝的一个新观点争论不休,这个问题最终也许会得到解决。

    1980年,曾经有报道说,在一个6500万年前形成的沉积物薄层中,发现了稀有金属铱,它的含量异常丰富。一些人认为,这可能是由于一个巨大的小行星或彗星撞击地球的结果。这种撞击也许深入到了地壳内部,引起火山喷发,造成大火和潮汐大浪。许多尘埃进入了平流层中,结果造成在很长一段时间内阳光无法抵达地球表面。这也许是导致包括所有恐龙在内的许多地球生物灭绝的原因。

    毫无疑问,6500万年前地球上曾有过一次“大灭绝”,发生过一次“大劫难”。然而,并不是所有的科学家都认为这是由巨大撞击引起的。例如,1987年就有人指出,如果地球突然经历了一个火山爆发期,许多火山大致同时喷发,那么也能造成一个足以使生物大量灭绝的巨大灾难。

    因此,目前存在两种对立的理论,即“撞击说”和“火山说”。

    ​这不仅仅是一个学术问题,因为我们将来也许还会遇到这样或那样的大灾难(万一哪天某个星体要撞击地球,我们也许会知道如何来避免这种撞击)。我们需要尽可能多地了解这种事件所产生的影响,希望将来一旦面临这种事件,我们可以采取某种应急措施。