阅读下面短文，根据短文内容，在短文后８１－８５小题中句子空白处填入适当的词语或句子。
We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another place at a certain time. They move for different 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 comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration is probably the migration of fish, which is called “salmon”（鲑鱼）. This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.
Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year, when the season of the bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where the go. So, sometimes we know why humans and animals move from one place to another place, but at other times we don’t. Maybe living things just like to travel.
81. The reason for most of the animals to move is _____________________.
[单选题]回答 71 ~ 75 题：根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。71H．ome can be a great place for children to study. It’s important to provide a workspace of their own where they can read books or just write a letter to their friens. Location （位置）72Kitchen and
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[单选题]阅读下面的短文，从短文后各题所给的A、B、C、D四个选项中选出能填入空白处的最佳答案。The2010WinterOlympicGameswilltakeplaceinVancouverandWhistler(惠斯勒)fromFebruary12to28.Astheworld’s41______athleteswillcompetethere,Canadaispreparingforitwell.Itwillbebroadcasted(播出)inCanada’stwo42______languag
[单选题]根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。I was ten when I first sat with my grandmother behind the cashier(收银台) in her general store. ______71_______ I quickly learned the importance of treating customers politely and saying “thank you.”A
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