Question

閱讀理解 　　We know that many animals do not stay in one place．Birds, fish and other animals move from one place to another 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(遷移)is probably the migration of fish, which is called “salmon”．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(近來)，scientists have studied the migration of a kind of lobster(龍蝦)．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 they go． 　　So, sometimes we know why humans and animals move from one place to another, but at other 　　times we don’t．Maybe living things just like to travel． (1) Most animals move from one place to another at a certain time to ________． [　　] A． give birth B． enjoy warmer weather C． find food more easily D． find beautiful places (2) The fish called “salmon” spends a long time in ________． [　　] A． salt water B． rivers C． fresh water D． its birthplace (3) The mice in northern Europe move when ________． [　　] A． they give birth B． the place gets too crowded C． the weather is bad D． they haven’t enough food (4) The lobsters move ________． [　　] A． to the fresh water B． at a certain time C． to the undersea D． to find more food (5) What is the main idea of the passage? [　　] A． Animals move to find food more easily． B． The migration of the fish called “salmon” is the most famous migration． C． Living things move from one place to another because they like to travel． D． Sometimes we know why and how living things move from one place to another, but sometimes we don’t．

Answer 1

答案：1．C;2．A;3．B;4．B;5．D;
解析：

(1)	起初一看，四個選項好像都在文中敘述過，但仔細分析題干中的“most animals”這一關鍵詞語，便可排除其它選項．在第一段最后一句中可找到答案的出處．
(2)	有關“salmon”的情況在第二自然段中作了敘述．這種魚出生在淡水中，后不到咸水地區(qū)居住，在那里度過一生中絕大部分時光．到老了以后又回到它出生之時的淡水之中．仔細分析題干中的“spend a long life”和短文中的關鍵句“There it spends its life．”便可斷定答案為A．
(3)	“they leave their mountain homes when they become too crowded．”一句是答案的出處．
(4)	該題答案的出處是文章的第三自然段．文中說，龍蝦是在海底成群結隊游動的時間是每年天氣不好的季節(jié)，目的及它們到哪里去誰也不知道，余項與文章敘述不符．
(5)	文中第二自然段敘述了“salmon”和北歐的一種老鼠遷移方向和原因；第三自然段敘述了龍蝦的游動情況，但原因不知道．最后一段開頭一句正是對本文主題的概括． 　　這篇短文講述了某些生物的遷移這一自然現(xiàn)象，并分析了遷移的原因．科學家們最近又研究了龍蝦海底成群結隊遷移的現(xiàn)象．它們選擇在每年天氣不好的季節(jié)里進行遷移，其中的原因及遷移的目的，科學家尚未弄清楚．