6.In Antarctica(南极),when spring comes,ice begins to melt,and the sun stays in the sky all night long.
In the brightly world,the large gray head of a Weddell seal (威德尔海豹) appears through a crack (裂缝) in the ice.The seal takes several deep breaths,and then she opens her mouth,turning her head from side to side.With her teeth,she gets rid of bits of ice.Seals are mammalOs(哺乳动物),and they need to breathe air,for which Weddell seals use their teeth to make sure their breathing holes stay open.
The seal makes the hole bigger,and when she can fit her large body through it,she jumps out onto the ice-she is getting ready to have a baby.On the ice shelf,the seal gives birth to a baby.The baby is about three feet long and is covered with thick fur that protects it from the cold wind.The baby drinks its mother's milk and grows quickly.With a few weeks,it is more than six feet long.Under the seal's skin is thick layer of fat called blubber,which keeps the seal warm in its frozen world.
When the baby seal is about two weeks old,it begins to dive with its mother.They slide through the breathing hole into the water below the ice,where the baby seal learns to swim,diving deeper and deeper.In order to stay underwater,it must learn to hold its breath and control its heart rate.
Below the ice,the sun shines brightly through the hole.Finding the opening to breathe is easy,but getting back onto the slippery ice can be difficult for a young seal.With practice and its mother's help,the baby seal soon feels at home both on the ice and under it.
The young seal spends more and more time below the ice,where it learns to hunt for food.When the young seal is about two months old,it will have to feed itself independently.When it becomes an adult,it will swim farther out in search of food,but it will always live on or under the ice.
71.Paragraph 2is mainly aboutD.
A.the function of Weddell seals'teeth
B.the living conditions of Weddlel seals
C.how Weddell seals move under the ice
D.how Weddell seals keep their breathing holes open
72.According to Paragraph 3,the baby sealD.
A.grows slowly
B.is still short after a few weeks
C.is born under the ice
D.is covered with thick fur
73.The baby seal begins learning to swim and dive when it is aboutB.
A.two days old B.two weeks old
C.two months old D.two years old
74.For a young Weddell seal,C.
A.its father's help is important
B.getting onto the ice shelf is easy
C.finding the breathing hole is easy
D.learning to hunt for food is unnecessary
75.The text is mainly aboutA.
A.Weddell seals'life
B.animals on and under the ice
C.how Weddell seals keep warm
D.what the winter in Antarctica is like.
分析 文章内容主要讲述了维尔德海豹的生活习性以及小海豹的细小的特点.
解答 71.D 推理题.根据文章第二段最后一句With her teeth,she gets rid of bits of ice.Seals are mammals,and they need to breathe air,for which Weddell seals use their teeth to make sure their breathing holes stay open.可知本段讲述的海豹如何让自己呼吸的洞打开着所使用的具体的做法.故D正确.
72.D 细节题.根据文章第3段第3句The pup is about three feet long and is covered with thick fur that protects it from the cold wind.可知小海豹出生的时候身上有很厚的皮毛,可以帮助它抵御寒冷跟的气候.故D正确.
73.B 细节题.根据文章第4段第一句When the pup is about two weeks old,it begins to dive with its mother.可知在2周大的时候,小海豹就跟着妈妈学习游泳了.故B正确.
74.C 细节题.根据文章第五段第2句Finding the opening to breathe is easy,but getting back onto the slippery ice can be difficult for a young seal.可知对于小海豹来说,找到一个洞呼吸空气是比较容易的.故C项正确.
75.A 主旨大意题.根据文章内容主要讲述了维尔德海豹的生活习性以及小海豹的细小的特点,结合选项,答案为A.
点评 本文是人文地理类阅读理解.做这类题材阅读理解时要求考生对文章通读一遍,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,结合选项选出正确答案.推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据.