时事语法填空 ：海冰融则帝企绝
美国一项研究结果表明，随着全球气温持续变暖，南极海冰消融的速度逐渐加快，帝企鹅(Emperor penguin)的生存空间不断遭受挤压。如果此现象一直得不到有效遏制的话，那么预估到 2100 年，绝大部分的帝企鹅族群将走向灭绝。

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Melting Ice Threatens Emperor Penguin Environment
Climate change is threatening the sea ice environment of Emperor penguins.
A new study suggests that 98% of Emperor penguin groups may be pushed close to ___1___(extinct) by the year 2100. And about 70 % of their groups ___2___(be) in danger by 2050. ___3___ research was published in the journal Global Change Biology.
Emperor penguins need secure sea ice to reproduce, to feed and to molt. Molting is the replacement of their old feathers with new ___4___(one).
The new study looked at overall warming developments and the increasing likelihood of extreme weather changes because of global warming. The study noted that ___5___(extreme)  low levels of sea ice in 2016 led to a large reproduction failure of an Emperor penguin group in Antarctica's Halley Bay. That year, ___6___(season) sea ice broke up ___7___ young penguins had time to develop waterproof(防水的) adult feathers. About 10,000 baby birds drowned. The group did not recover afterward.

Emperor penguins are the world's ___8___(large) penguins. There are currently between 625,000 and 650,000 of them worldwide. The penguins survive by ___9___(gather) in groups of several thousand birds. But they cannot survive ___10___ enough sea ice.

答案解析
1.extinction 考查词类转换。 be pushed close to extinction被推向灭绝的边缘。
2.will be 考查时态。因是2050年的事情，用一般将来时。
3.The考查冠词。特指上句讲到的研究，表示特指，用定冠词。
4.ones 考查代词。指代名词复数feathers，相应的代词也用复数ones。
5.extremely 考查词类转换。 extremely low 极低的。修饰形容词low，用副词作状语。
6.seasonal 考查词类转换。seasonal sea ice季节性海冰。修饰名词短语sea ice，用形容词作定语。
7.before 考查连词。表示“在……之前，还没来得及”，用before。句意：那一年，季节性海冰在小企鹅还不来得及长出防水的成年羽毛之前就已经融化了。
8.largest 考查比较等级。表示“最大的”，用最高级。
9.gathering 考查非谓语。by doing 通过做……。介词后用动词ing形式。
10.without 考查介词。根据句意“但如果没有足够的海冰，它们就无法生存”，用without表示“如果没有”。