Question

【题目】语法填空

Polar bears live in such environment that is too cold for most animals. For much of the year, they live and hunt on the 1 (freeze) Arctic sea ice. Nature has prepared them for the cold conditions but nothing has prepared them for the danger 2 threatens(威胁) their only home.

The polar bears’ world is melting. Polar bears 3 (suffer) in a warmer world are in danger. Studies show that the polar ice 4 (reduce) by 9.8% every 10 years since 1978.At present , about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their 5 (survive). ＂The sea ice is more than just the platform that the bears walk 6 ,＂ says Andrew Derocher, who studies North American polar bear populations. ＂Without 7 , they can’t exist.＂

Some melting and refreezing of the polar ice is natural. But in a 8 (warm) world, these cycles speed up, and bears have less time to hunt. 9 (normal), they have three months in the spring when they gain more weight and the extra fat is used later, 10 the bears are not actively hunting. Therefore, it is urgent to protect the environment and maintain the ecological balance.

Answer 1

【答案】

【1】frozen

【2】that/which

【3】suffering

【4】has reduced

【5】survival

【6】on

【7】it

【8】warmer

【9】Normally

【10】when

【解析】

【文章大意】文章介绍了北极熊生存环境的变化以及这种变化对北极熊的影响。

【1】 考查形容词。修饰名词sea ice用形容词，freezing意为＂寒冷的，冰冻的＂。

【2】 考查定语从句。分析句子结构可知，＂_____ threatens their only home＂是定语从句，修饰the danger，引导词在从句中作主语，指物，故用关系代词that/which引导从句。

【3】 考查非谓语动词。分析句子结构可知，＂_____ in a warmer world＂是定语，修饰polar bears，polar bears和suffer之间是主动关系，故用现在分词作定语。

【4】 考查时态和主谓一致。该句时间状语为＂since 1978＂，since引导时间状语，主句用现在完成时，且主语为不可数名词the polar ice，根据主谓一致原则，该空填has been reduced。

【5】 考查名词。their是形容词性物主代词，后面跟名词，故该空填survival。survival不可数。

【6】 考查介词。分析句子结构可知，＂that the bears walk_____＂是定语从句，修饰the platform，由语境可知，北极熊在平台上行走，walk是不及物动词，故后面要跟介词on，表示＂在……之上＂。

【7】 考查代词。it指代the sea ice，由语境可知，没有海冰，北极熊无法生存。

【8】 考查比较级。由语境可知，在一个更加温暖的世界中，这些循环加速，北极熊狩猎的时间减少。故该处填形容词的比较级。

【9】考查副词。由语境可知，正常情况下，每年春天，北极熊有三个月的时间长胖，多余的脂肪供以后使用。修饰整个句子用副词，故该空填Normally。

【10】 考查时间状语从句。句意：春天三个月的时间里，北极熊会长胖。当北极熊狩猎不活跃的时候，它们就会消耗这些脂肪。when引导时间状语从句，意为＂当……时候＂。