Do you know why so 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”(鮭魚). 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 will return 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(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 place, but at other times we don’t. Maybe living things just like to travel.

小題1:The reason for most of the animals to move is ________.
A．to get away from un-crowded placesB．to find their own parents
C．to want to kill themselvesD．to find food more easily
小題2:Where does young salmon(鮭魚) spend its life?
A．In fresh water.B．In salt water.
C．In mountain homes.D．In its birthplace.
小題3: When do the lobsters(龍蝦) begin to move another place?
A．When their homes become too crowded.
B．When the season of the bad weather arrives.
C．When they want to give birth.
D．When their food is eaten up.
小題4: The underlined word migration in the passage means ________.
A．遷徙B．習(xí)性
C．運(yùn)動(dòng)D．尋覓

小題1:D
小題2:B
小題3:B
小題4:A

試題分析：鳥兒、魚和其他的動(dòng)物為什么會(huì)從一個(gè)地方遷居到另一個(gè)地方呢？大多數(shù)遷居是想更容易地找到食物。其他的是要離開太擁擠的地方。比如鳥在冬天來臨之前，遷徙到溫暖的地方；有些魚溫水去，卻要到冷水里覓食。再如鮭魚和龍蝦的遷徙也很有意思。
小題1:細(xì)節(jié)理解題。根據(jù)most of them move to find food more easily,可知，大多數(shù)遷居是想更容易地找到食物。故選D。
小題2:細(xì)節(jié)理解題。根據(jù)This fish is born in fresh water but it travels many miles to salt water. There it spends its life.可知，鮭魚生活在咸水了。故選B。
小題3:推理判斷題。根據(jù)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.可知，每年當(dāng)壞天氣的季節(jié)到來時(shí)，龍蝦們就排著隊(duì)開始橫穿海底。故選B。
小題4:詞義推測(cè)題。根據(jù)前后句子的意思可知，最著名的遷徙可能是一種叫鮭魚的魚。它們生在淡水了，卻要跋涉許多英里到咸水了生活。老了在回到出生的淡水區(qū)生兒育女，然后死去。migration的意思是move，遷居、遷徙。故選A。
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