[解析]
答案DACD.文章介绍是叫Judy的狗在追赶一只羊的时候,从悬崖上掉下来.主人努力寻找几个小时无果,以为它已经死去就放弃了,结果几天后,意外得到消息,狗还活着.真是很幸运的事情.
50.细节理解题.根据文章第一段的句子:The four-yea r-old dog set off racing after the sheep across several fields…,Then she ran along the edge of a cliff(悬崖) and fell 100 feet,bouncing off a rock into the sea.可知叫Judy的狗在追赶一只羊的时候,从悬崖上掉下来.故选D.
51.细节理解题.根据文章第五段的句子:A birdwatcher,armed with a telescope,found the pet sitting desperately on a rock.可知事故后是一个观鸟者看见了Judy,故选A.
52.细节理解题.根据文章第六段的句子:It was a very lucky dog.She survived because of a plentiful supply of fresh water.可知在Judy的事故中运气起着至关重要的作用.故选C.
53.主旨大意题.根据文章的内容可知介绍一只狗掉到悬崖下面死里逃生的经历,所以用Coming Back from the Dead比较合适.故选D.