英语专业四级考试试题答案与详解听力原文PART Ⅱ DICTATIONSalmonEvery year, millions of salmon swim from the ocean into the mouths of rivers and then steadily up the rivers
Passing through waters, around rocks and waterfalls, the fish finally reach their original streams or lakes
They dig out nests in the riverbed and lay their eggs
Then, exhausted by their journey, the parent salmon die
They have finished the task that nature has given them
Months, or years later, the young fish start their trip to the ocean
They live in the salt water from 2-7 years, until they, too are ready to swim back to reproduce
Their life cycle helps man provide himself with a basic food-fish
When the adult salmon gather at the river mouths for the annual trip up the rivers, they are in the best possible condition, and nearly e