阅读理解。 Polar bears live in the coldest environments on Earth

题文

阅读理解。

Polar bears live in the coldest environments on Earth-the Arctic. Called "ice bears"  in manyEuropean languages, polar bears depend on the ice that surrounds them for their survival. As the Arctic climate changes and the ice slowly disappears, polar bears face an increasingly uncertainfuture. Polar bears impress us with their incredible size, power and ability to survive in the cold Arctic. The giants can stand three meters tall and weigh over 500kg, and they spend their lives travelingthroughout the Arctic. Two layers of fur keep them warm. Interestingly,the hairs are hollow in orderto direct the sunlight straight to the skin. Undemeath their fur, polar bears have anadditional l0-cm-layer of fat. Polar  bears  hunt  ringed als (环斑海豹), which live under the Arctic ice. They wait patientlyfor hours beside holes in the ice pack (浮冰群) for als to surface and breathe. Using their great strength , the bears pull the heavy animals up onto the ice. The als provide much of the fat the bears need for warmth. Since 2006 , polar bears  have been  labeled  a vulnerable  (脆弱的) species. Most experts feelthe threat to polar bears comes not from hunters or predators(食肉动物),but from the gradual meltingof Arctic ice. Due to global climate change, the Arctic region is getting warmer. Arctic ice is breaking up earlier in the spring, and its area is decreasing. Problems polar bears around Canada's Hudson Bay are facing may indicate what lies ahead for polar bears elwhere. Hudson Bay is located at the southern limit of the polar bears' territory(领地) . Currently,the ice there breaks up three weeks earlier in the spring than it did 20 years ago. Polar bears on Hudson Bay fast during the summer,waiting for ice to form in the fall to hunt. Every year,theSummer gets longer, and the bears get skinner. Over the past 25 years, the average weight of the female bears has dropped 68kg. This loss affects their ability to reproduce, and already the number of births has dropped 15% . Unless the bears can leam to survive global climate change, the giants of the ice may one day disappear.

1. What puts polar bears in a challenging situation in the future?   A. More humans hunting in the Arctic.B. The warming climate and melting ice.C. The reducing number of food resources.D. The changing weather and new habitats.2. Paragraph 2 is mainly concemed with___________.   A. the description of polar bearsB. polar bears' pattern of survivalC. brief information on polar bearsD. the types of polar bears3. Which description of polar bears is TRUE?A. Polar bears are usually of medium sizeB. Polar bears feed mainly on ringed als.C. In winter polar bears live under water.D. Polar bears travel beyond the Arctic in summer.4. The female bears have lost weight greatly in the past decades becau___________.   A. there are a few ringed als to huntB. winter days are getting much longerC. they have to give birth to more youngD. they have to wait longer before hunting5. We can feel that the author's tone for polar bears is__________.A. sympathetic B. optimisticC. hopefulD. indifferent 题型：未知难度：其他题型

答案

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健康环保累阅读概念：

健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。体裁有记叙文、 说明文、议论文和各种应用文。

健康环保类文章阅读技巧：

   健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。阅读此类短文要以现象或事物为中心进行思考，理解现象产生的原因、条件和客观规律等。同时要抓住事物的特征、用途和相互关系等。科普环保类文章一般为说明文，从结构上看大致可分为三个部分：   第一部分一般是文章的首段，主要用来提出文章的主题，即文章想要阐述、说明的主要内容；   第二部分是文章的主体，可由若干个段落组成，对文章的主题进行展开说明；   第三部分是结尾段，对文章的主题进行归纳总结。这类文章多用一般现在时，而且一般多使用客观性词语表述。有时为了强调客观性，也常使用被动语态。   从近几年的考试题来看，科普环保类的文章越来越与人们的实际生活相接近。由于此类文章缺乏故事情节，很多同学对此类文章感到费解。但一般的科普类文章都是就事论事，需要逻辑推理和想象的时候较少，因此此类阅读题也没有同学们想象中的那么难，只要多加训练，就能较好地答题。【阅读策略】 1、概要(Summarizing)：  阅完材料后，将所阅材料浓缩，摘要，做出所阅材料的书面或口头梗概。 2、组织(Organization)：  阅读后根据阅读内容，识别观点、人物、事件之间的关系以及文章的结构关系。如：时间关系、比较或对比关系、相关关系及因果关系等。