任务型阅读(共5小题.每小题2分.计10分) 阅读短文.并按要求完成下列句子. We kn

任务型阅读（共5小题，每小题2分，计10分）

阅读短文，并按要求完成下列句子。

We know that many animals do notstay in one place．Birds，fish and other animals move from oneplace to another place at a certain time．They move fordifferent reasons: most of them move to find food more easily，but others move to get away from places that are too crowded．

When cold weather es，many birds move to warmerplaces to find food．Some fishes give birth in warmwater and move to cold water to feed．The most famousmigration is probably the migration of fish，which iscalled “salmon”（鲑鱼）．This fish is born in fresh waterbut it travels many miles to salt water．There it spends its life．When it is old，it returns to its birthplace in fresh water．Thenit gives birth and dies．In northern Europe，there is a kind of mouse．They leave theirmountain homes when they bee too crowded．They movedown to the low land．Sometimes they move all the way tothe seaside，and many of them are killed when they fallinto the sea．

Recently，scientists have studiedthe migration of a kind of lobster(龙虾)．Every year，when the season of the badweather arrives，the lobsters get into a long line andstart to walk across the floor of the ocean．Nobodyknows why they do this，and nobody knows where they go．So，sometimes we know why humans and animalsmove from one place to another place，but at other timeswe don’t．Maybe living things just like to travel．

1.The reason for most of the animals to move is __________________．

2.Find the word in the passagewhich means “ the movement from one place to another of a large group ofanimals” and write it down here: __________________．

3.The underlined word “There” in the second paragraphrefers to (指的是)____________．

4.The salmon es back to its birthplace in order to __________________．

5.The lobsters begin to move to another place when __________________．