Question

【题目】语法填空
Polar bears are suffering in a (warm) world.
Polar bears live in environments too cold for most animals. much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared for the cold conditions. But nothing has prepared the bears for the danger that (threat)the only home they know.
The polar bears' world is melting. Studies show that the polar ice has reduced by 9.8% every 10 years 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher, scientist who studies North American polar bear populations. “ it, they can't exist.”
Some melting and refreezing of the polar ice is natural. in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later, the bears are not actively hunting.

Answer 1

【答案】warmer；For/During；them；threatens /is threatening；since；survival；a；Without；But；when
【解析】本文是一篇说明文，介绍了全球变暖，北极熊的生存现状与面临的危险。
（1）考查形容词。 根据后下文than，可知要用比较级 ，故填warmer。
（2）考查介词。 在很多年中 用for/during。
（3）考查动词词组 prepare sb for sth 这里指北极熊 ，故填them。
（4）考查动词时态。 危险使他们受到威胁 ，用一般现在时或者现在进行时，故填threatens/is threatening。
（5）考查连词。句意：自从1978年以来，北极冰每十年减少9.8% 而现在完成时也对应since ，故填since。
（6）考查名词。 their后应接名词， 故填survival。
（7）考查冠词。 scientist是可数名词，此处表示泛指， 故填a 。
（8）考查介词。句意： 如果没有冰，北极熊就无法生存。故填Without。
（9）考查连词。 Some melting and refreezing of the polar ice is natural 与these cycles speed up，and bears have less time to hunt 是转折关系 ，故填But。
（10） 考查连词。 当北极熊不积极捕猎时，多余的脂肪就会在之后使用。故填when。