Question

【题目】阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

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】

试题分析：通过本文考查学生的词性在语境中的正确运用能力。包括动词的时态，非谓语动词，副词，代词，连词等。

【1】frozen 考查形容词。这里用形容词修饰名词, frozen 冰冻的。

【2】that/which 考查定语从句关系词。这里the danger是先行词，在定语从句中作主语，所以用关系代词that/which。

【3】suffering 考查非谓语动词。suffering in a warmer world是非谓语动词短语做后置定语修饰Polar bears，Polar bears是suffer的逻辑主语，所以用动词的-ing形式suffering。

【4】has reduced 考查谓语动词的时态。since 1978提示是现在完成时，the polar ice相当于it和reduce自己是主谓关系，所以是has reduced。

【5】survival 考查名词。用名词作介词宾语for their，所以用名词形式survival。

【6】on 考查介词。the platform 和不及物动词walk之间加on才能构成介词和宾语的关系。

【7】it 考查代词。it指the polar ice，意思是：没有极地冰，北极熊就不能存在。

【8】warmer 考查形容词比较级。极地冰由于变暖而融化，冷了在结冰，但是比较暖和的世界里，这样的循环就会加速。

【9】Normally考查副词。这里用副词修饰全句，句意：正常情况下，他们在春天有3个月，变胖增加脂肪以备后用。

【10】when 考查非限制性定语从句的关系词。句意：脂肪在北极熊不能积极主动去打猎的时候用。