2003年英语专业四级听力真题

听健依然

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 of the rivers, they are in the best possible condition.And nearly every harbour has its salmon fishing fleet ready to catch thousands for markets.

听健依然

Then, exhausted by their journey, the parents salmon die.They have finished the task that the nature has given them.Months or years later,the young fish start their trip to the ocean.They live in the salt water from two to seven years,until they too are ready to swim back to reproduce.

听健依然

SALMON Every year millions of salmon swim from the ocean into the mouths of the rivers and then steadily out of the rivers.Passing through waters,around the rocks and waterfalls,the fish finally reach their original streams or lakes.They dig up nests in the river bed and lay their eggs.