题目内容
20．概要写作．阅读下面短文，根据其内容写一篇60词左右的内容概要．With global warming and melting ice，it isn't easy being a polar bear anymore．Some studies have predicted that polar bears could die out by the end of the century．The good news is not all researchers think the bears are absolutely disappearing．Scientists at the American Museum of Natural History（AMNH） have published a new paper indicating that things might not be as bad for polar bears as some scientists expect．
To understand the reason for the researchers'cautious optimism，we must first understand the factors that are threatening the polar bear's existence．Polar bears consume a diet of mainly young seals．In order to hunt these seals，polar bears need to rest at the top of sea ice---the same ice that is increasingly melting for most of the year thanks to climate change．In another 50years，experts expect that the Arctic will be too warm for sea ice to form for half of the year，leaving polar bears without a reliable food source and in serious danger of starvation．
As it turns out，alternative food sources for the polar bears aren't completely out of the question．For as long as biologists have tailed after the animals，they've seen polar bears eating animals found on land like caribou（驯鹿） and snow geese---as well as the snow geese's eggs．
Can polar bears actually survive off these alternative food sources for long periods of time？To figure this out，researchers calculated the nutrients that a caribou and snow geese diet would provide．They found that even adult male polar bears would be able to obtain more calories than they would burn in hunting these meals．Moreover，the food would provide the food necessary to avoid starvation during the summer months．
Unfortunately，not all polar bears have tended to seek food on land．That said，the researchers expect that necessity would push more polar bears to hunt on land to avoid starvation．They also expect that the bears could learn from their fellow bears how to hunt on land until the practice becomes second nature．
分析 题目要求根据所给内容，写一篇60词左右的内容概要．题目主要考查学生把握文章主旨大意和段落大意的能力以及总结概括能力．熟练掌握从句、非谓语动词等语法知识，对遣词造句也有很大帮助．
亮点说明：参考答案的前两句是对文章主旨大意的概括，后两句是对第二三四段的总结．北极熊找到了新的食物，但并非所有的北极熊都会去陆地上捕猎．为了避免饿死，这是北极熊应该学会的．
高分句型一：
With global warming and melting ice，some scientists think that polar bears could die out by the end of the century．
随着全球气候变暖，冰川融化，一些科学家认为，到本世纪末北极熊可能消失．
高分句型二：
They have found polar bars have found alternative food sources and they can survive by hunting animals on land instead of your seals．
他们已经发现了北极熊找到替代的食物来源，与海豹不同的是他们可以通过狩猎动物生存在陆地上．
解答 With global warming and melting ice，some scientists think that polar bears could die out by the end of the century（高分句型一）．However，other scientists think that polar bears could die out by the end of the century．However，other scientists don't think so．They have found polar bars have found alternative food sources and they can survive by hunting animals on land instead of your seals（高分句型二）．The researchers expect all polar bears learn how to hunt on land to avoid starvation．
点评 英语写作是一项主观性较强的测试题．它不仅考查学生的写作基础而且还考查学生在写作过程中综合运用语言的能力．在撰写时要注意主谓语一致，时态呼应，用词贴切等．要提高英语写作水平，需要两方面的训练：一是语言基础方面的训练，要有扎实的造句、翻译等基本功，即用词法、句法等知识造出正确无误的句子；二是写作知识和能力 方面的训练以掌握写作方面的基本方法和技巧．
