考研英语一（完形填空）模拟试卷378
完型填空
The permanence of frozen ground in the Arctic is no longer guaranteed as Earth\’s temperatures continue to climb.【C1】________how much the degradation of so-called permafrost will【C2】________climate change is still unclear, according to the Intergovernmental Panel on Climate Change\’s (IPCC\’s) Sixth Assessment Report,【C3】________this week.
The uncertainty leaves researchers with a(n)【C4】________ hole in their climate projections.
Permafrost covers a quarter of the Northern Hemisphere\’s land and【C5】________around 1.5 trillion metric tons of organic carbon, twice as much as Earth\’s atmosphere currently【C6】________. Most of this carbon is the【C7】________of ancient life encased in the frozen soil for up to hundreds of thousands of years.
In recent decades, permafrost has【C8】________because of global warming from heat trapped【C9】________by carbon dioxide released to the atmosphere from burning fossil fuels. Arctic warming is【C10】________at twice the global average rate since 2000, according to the National Oceanic and Atmospheric Administration. As that increase【C11】________the thaw of permafrost, the organic carbon contained within it【C12】________and releases carbon dioxide, exacerbating climate change.
But climate scientists are unsure how much carbon will be released【C13】________permafrost and when, which is reflected in the【C14】________of estimates provided by this week\’s IPCC report. This uncertainty【C15】________climate change projections, making it【C16】________to know whether the world\’s nations are on【C17】________to meet targets designed to limit global warming【C18】________in the 2015 Paris Agreement. Creating policies to meet those【C19】________hinges on a precise understanding of how much carbon dioxide【C20】________the atmosphere each year.
1.【C1】(B)
A. Moreover
B. But
C. So
D. Hence
解析：考查逻辑关系。本句意为“__________根据联合国政府间气候变化专门委员会（IPCC）本周_________第六次评估报告，目前仍不清楚所谓的永冻层退化将在多大程度上______气候变化”。分析可知，本句是在说明the degradation of so-called permafrost（所谓的永冻层退化）与climate change（气候变化）之间的关系。由首句“北极冻土的永久性也无法得到保证”及关键词unclear（不清楚的）可知，空格处应填表示转折关系的连接词，使第一、二句的含义发生转折，B项But“但是”代入文中符合题意。故本题选B干扰项Moreover“此外，而且”表递进关系，So“因此”和Hence“因此，所以”表因果关系，代入文中均不符合逻辑关系，故排除。
2.【C2】(A)
A. worsen
B. alter
C. deprive
D. drop
解析：考查动词辨析。本句意为“但根据联合国政府间气候变化专门委员会（IPCC）本周________第六次评估报告，目前仍不清楚所谓的永冻层退化将在多大程度上________气候变化”。首句指出，地球温度上升已不能确保北极冻土的永久存在，且由第三段最后一句可知，永冻层的融化会exacerbating climate change（加剧气候变化），因此空格处应填一个与exacerbate含义相近的词。分析可知，worsen“恶化”代入文中符合题意。故本题选A。
3.【C3】(C)
A. drafted
B. submitted
C. released
D. raised
解析：考查动词辨析。本句意为“但根据联合国政府间气候变化专门委员会（IPCC）本周________第六次评估报告，目前仍不清楚所谓的永冻层退化将在多大程度上加剧气候变化”。分析可知，本题考查空格处所填词与Report（报告）之间的关系，C项released“发表；公布；公开”代入文中符合题意，即“发表报告”。故本题选C。
4.【C4】(D)
A. empty
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