Question

Polar bears are suffering in a1. (warm) world than ever before.

Polar bears live in environments too cold for most animals. For much of the year, 2.live and hunt on the frozen Arctic sea ice. Nature has prepared them for the cold conditions. But nothing has prepared the bears for the danger threatening the only home3.they know.

The polar bears’ world is melting. Studies show that the polar ice4.(reduce) by 9.8% every 10 years since 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their5. (survive). “The sea ice is more than just this platform that the bears walk over.” says Andrew Derocher, 6.scientist who studies North American polar bear populations. “7.it, they can’t exist.”

Some melting and refreezing of the polar ice is natural. 8.in a warmer world, these cycles speed up, and bears have less time9.(hunt). Normally, they have three months in the spring when they gain more weight. The extra fat is used later, 10. the bears are not actively hunting.

Answer 1

1.warmer

2.they

3.that

4.has reduced

5.survival

6.a

7.Without

8.But

9.to hunt

10.when

【解析】

试题解析：考察单词的正确形式及单词拼写，首先要结合前后文分析空白处的语法结构，然后根据括号中的词进行变形。没有给定词的时候就需要根据前后文的意思进行推断分析，找到既合语法又符合意思的单词。

1. 考察比较级的用法。根据词性，空白处需要一个形容词性的词；其次根据后文中than可知空白处需要形容词的比较级，warm表示温暖的，比较级形式为warmer，故填warmer。“Polar bears are suffering in a (warm) world than ever before”北极熊正在遭受一个比以前更温暖的环境。

2. 考察细节理解题。根据前后文“Polar bears live in environments too cold for most animals. For much of the year, live and hunt on the frozen Arctic sea ice.”推测句意：北极熊居住的环境对大多数动物来说都太冷了，在一年的大多数时间里，他们居住在北极的冰面上并觅食。故填they。

3. 考察定语从句引导词。后文they know作home的定语，因为home前有修饰词the only，故引导词只能为that，故填that。“But nothing has prepared the bears for the danger threatening the only home they know”句意；但是他们没有谁也没有为他们面临的威胁做准备。

4. reduced 考察完成时态。根据前后文“Studies show that the polar ice (reduce) by 9.8% every 10 years since 1978”中since可以推断主句时态应为现在完成时态。故空白处太难has reduced。句意：研究表明，北极的冰自从1978年以来每十年就减少百分之九点八。

5. 考察survive的名词形式。根据前后文“Polar bears depend on the sea ice for their (survive)”可知空白处缺乏名词形式。给出的survive是动词，意为存活，幸存。名词形式为survival，意为生存的环境。故填survival。句意：北极熊依靠海面上的冰作他们的生存环境。

6. 考察推理判断题。根据前后文“says Andrew Derocher, scientist who studies North American polar bear populations”空白处缺乏冠词。此处表明此人是一个科学家，后文作Andrew Derocher的定语，此时还不是特指，故不能使用定冠词the，故填a。句意：Andrew Derocher说道，Andrew Derocher是一个研究北美北极熊数量的科学家。

7. 考察细节理解题。根据前后文. “ it, they can’t exist.”前文提到北极熊生存的海面上的冰，而海上的冰正在融化，所以it代指海面上的冰。推测句意：没有那些冰，他们就不能生存。故填without。

8. 考察推理判断题。根据前后文“Some melting and refreezing of the polar ice is natural. in a warmer world, these cycles speed up”空白处缺少连词，前后文句意：一些北极冰融化再结冰是很自然的，在一个更温暖的环境下，这种循环加速了。可以推测这加速对北极熊是不利的，所以空白处应为转折关系。故填but。

9. hunt 考察动词不定式用法。根据前后文“these cycles speed up, and bears have less time (hunt)”空白处需要动词不定式作定语，故填to hunt。句意：这样的循环加速了，所以北极熊们觅食的时间变的更少了。

10. 考察细节理解题。根据前后文“The extra fat is used later, the bears are not actively hunting”推测句意：当北极熊觅食不那么活跃时，那些多余的脂肪就会被使用。从前文中的when也可知此处应填when与之呼应。

考点：考察科技文阅读。