Question

【題目】語法填空
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】本文是一篇說明文，介紹了全球變暖，北極熊的生存現(xiàn)狀與面臨的危險(xiǎn)。
（1）考查形容詞。 根據(jù)后下文than，可知要用比較級(jí) ，故填warmer。
（2）考查介詞。 在很多年中 用for/during。
（3）考查動(dòng)詞詞組 prepare sb for sth 這里指北極熊 ，故填them。
（4）考查動(dòng)詞時(shí)態(tài)。 危險(xiǎn)使他們受到威脅 ，用一般現(xiàn)在時(shí)或者現(xiàn)在進(jìn)行時(shí)，故填threatens/is threatening。
（5）考查連詞。句意：自從1978年以來，北極冰每十年減少9.8% 而現(xiàn)在完成時(shí)也對(duì)應(yīng)since ，故填since。
（6）考查名詞。 their后應(yīng)接名詞， 故填survival。
（7）考查冠詞。 scientist是可數(shù)名詞，此處表示泛指， 故填a 。
（8）考查介詞。句意： 如果沒有冰，北極熊就無法生存。故填Without。
（9）考查連詞。 Some melting and refreezing of the polar ice is natural 與these cycles speed up，and bears have less time to hunt 是轉(zhuǎn)折關(guān)系 ，故填But。
（10） 考查連詞。 當(dāng)北極熊不積極捕獵時(shí)，多余的脂肪就會(huì)在之后使用。故填when。