单选题 In face of global warming, much effort has been focused on reducing greenhouse gas emissions through a variety of strategies. But while much of the research and innovation has 26 on finding less-polluting energy alternatives, it may be decades before clean technologies like wind and solar meet a significant portion of our energy needs.
In the meantime, the amount of CO₂ in the air is rapidly 27 the limits proposed by the Intergovernmental Panel on Climate Change (IPCC). 'As long as we're consuming fossil fuels, we're putting out CO₂, ' says Klaus Lackner, a geophysicist at Columbia University. 'We cannot let the CO₂ in the atmosphere rise 28 . '
That sense of urgency has increased interest in capturing and storing CO₂. which the IPCC says could provide the more than 50% reduction in emissions thought needed to reduce global warming. 'We see the 29 for capture and storage to play an integral role in reducing emissions, ' says Kim Corley, Shell's senior advisor of CO₂ and environmental affairs. That 30 thinking strategy is gaining support. The U. S. Department of Energy recently proposed putting $1 billion into a new $2.4 billion coal-burning energy plant. The plant's carbon-capture technologies would serve as a 31 project for other new coal-burning plants.
But what do you do with the gas once you've captured it? One option is to put it to new uses. Dakota Gasification of North Dakota captures CO₂ at a plant that 32 coal into synthetic natural gas. It then ships the gas 200 miles by pipeline to Canada, where it is pumped underground in oil recovery operations. In the Netherlands, Shell delivers CO₂ to farmers who pipe it into their greenhouses, increasing their 33 of fruits and vegetables.
However, scientists say that the scale of CO₂ emissions will require 34 amounts of long-term storage. Some propose storing the CO₂ in coal mines or liquid storage in the ocean. Shell favors storing CO₂ in deep geological structures such as saline (盐的) formations and 35 oil and gas fields that exist throughout the world.
A. indefinitely
B. critical
C. vast
D. concentrated
E. yield
F. approaching
G. accurately
H. potential
I. storage
J. exhausting
K. forward
L. converts
M. commented
N. pilot
O. conveys

问答题

【正确答案】D

【答案解析】根据空格处和上下文意思，判断此处应填入动词的过去分词形式，且能与on搭配。文章提到“然而，尽管有许多研究和创新都在 ______ 寻找污染较小的替代能源，但若要使风能和太阳能等清洁能源满足我们对能源的大部分需求，可能还需要数十年时间”，将选项中动词的过去分词commented和concentrated分别代入原文，只有concentrated(专注于)符合此处用法和句意。

问答题

【正确答案】F

【答案解析】根据句子结构，此处需填入动词的现在分词。文中提到“与此同时，空气中二氧化碳的含量正迅速 ______政府间气候变化专门委员会所提出的极限值”。将选项中的现在分词分别代入原文，只有approaching(接近)符合句意。

问答题

【正确答案】A

【答案解析】根据句子结构，此处需填入副词，修饰前面的动词rise。文中提到“我们不能让大气中的二氧化碳含量 ______ 上升”，将选项中的副词分别代入原文，只有indefinitely(无限地)可修饰rise，符合句意。

问答题

【正确答案】H

【答案解析】由空格前的定冠词the判断空格处填入名词。根据句意“我们认为碳捕集及封存有发挥减排不可或缺作用的 ______ ”，将选项中三个名词分别代入句子，只有potential (潜力，潜能)符合句意。

问答题

【正确答案】K

【答案解析】空格前为代词that，空格后为thinking strategy，由此可判断，空格处应填入形容词。文中提到“这种 ______战略正逐渐获得人们的支持”，选项中的形容词只有forward (先进的，前瞻的)可修饰thinking strategy，且符合句意。

问答题

【正确答案】N

【答案解析】空格前为不定冠词a，空格后为名词project，由此可知此处应填入形容词。根据句意“该电厂的碳捕获技术将作为一个 ______ 项目”，选项中的形容词pilot与project 搭配，意为“试点项目”，符合句意。

问答题

【正确答案】L

【答案解析】根据句子结构可知，that引导的从句中缺少谓语动词，空格处应填入动词。文中提到“将煤 ______ 为合成天然气的工厂”，分析原文可知，该句时态为一般现在时，将选项中conveys和converts分别代入句中，显然只有converts(转化)符合句意。

问答题

【正确答案】E

【答案解析】由空格前的their及空格后的of可知，空格处应填入名词。文中提到“……增加了水果和蔬菜的 ______ ”，结合选项中剩下的名词，yield(产量)符合句意。

问答题

【正确答案】C

【答案解析】空格前为动词require，空格后是名词amounts，所以此处应该填入一个形容词。文中提到“二氧化碳的排放规模要求进行 ______ 长期的封存”，选项中的形容词可以修饰amounts的只有vast(大量的)。

问答题

【正确答案】J

【答案解析】由句子结构可知，空格处应填入形容词修饰oil and gas fields。根据句意“以及遍及世界各地的 ______ 油气田中”，结合选项中的形容词，只有exhausting(枯竭的)符合题意。