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 2 is mainly about ________.

　　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 seal ________.

　　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 about ________.

　　A. two days old

　　B. two weeks old

　　C. two months old

　　D. two years old

　　74. For a young Weddell seal, ________.

　　A. its father’s help is important

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