New genetic analysis has revealed that many Amazon tree species are likely to survive human-made climate warming in the ing century, contrary to previous findings that temperature increases would cause them to die out. A study, 1 in the latest edition of Ecology and Evolution, reveals the 2 age of some Amazonian tree species -- more than 8 million years -- and 3 shows that they have survived previous periods as warm as many of the global warming imagined periods 4 for the year 2100.
The authors write that, having survived warm periods in the past, the trees will 5 survive future warming, provided there are no other major environmental changes. 6 extreme droughts and forest fires will impact Amazonia as temperatures 7 , the trees will stand the direct impact of higher temperatures. The authors 8 that as well as reducing greenhouse gas emissions to minimize the risk of drought and fire, conservation policy should remain 9 on preventing deforestation（采伐森林）for agriculture and mining.
The study disagrees with other recent researches which predicted tree species’ extinctions 10 relatively small increases in global average air temperatures.
Study co-author Dr Simon Lewis (UCL Geography) said the 11 were good news for Amazon tree species, but warned that drought and over-exploitation of the forest remained major 12 to the Amazon’s future.
Dr Lewis said: “The past cannot be pared directly with the future. while tree species seem likely to 13 higher air temperatures than today, the Amazon forest is being transformed for agriculture and 14 , and what remains is being degraded by logging, and increasingly split up by fields and roads.
“Species will not move as freely in today’s Amazon as they did in previous warm periods, when there was no human 15 . Similarly, today’s climate change is extremely fast, making parisons with slower changes in the past 16 .”
“With a clearer 17 of the relative risks to the Amazon forest, we 18 that direct human impacts -- such as forest clearances for agriculture or mining -- should remain a key point of conservation policy. We also need more aggressive 19 to reduce greenhouse gas emissions in order to make minimum the risk of drought and fire impacts and 20 the future of most Amazon tree species.”
【小题1】A．advertisedB．describedC．publishedD．presented【小题2】A．frighteningB．surprisingC．excitingD．interesting【小题3】A．stillB．neverthelessC．howeverD．therefore【小题4】A．assessB．confirmC．forecastD．promise【小题5】A．particularlyB．probablyC．merelyD．possibly【小题6】A．SinceB．AlthoughC．When D．If【小题7】A．riseB．change C．dropD．end【小题8】A．considerB．decideC．guaranteeD．remend【小题9】A．basedB．builtC．focusedD．made【小题10】A．in relation toB．in response toC．in reply toD．in reference to【小题11】A．findingsB．thoughtsC．inventionsD．writings【小题12】A．threatsB．disadvantagesC．embarrassmentsD．instructions【小题13】A．acceptB．tolerateC．permitD．Require【小题14】A．farmingB．plantingC．cateringD．mining【小题15】A．powerB．influenceC．desireD．violence【小题16】A．difficultB．clear C．easyD．important【小题17】A．beliefB．directionC．understandingD．suggestion【小题18】A．doubtB．concludeC．calculateD．prefer【小题19】A．thoughtB．guidanceC．protectionD．action【小题20】A．secureB．advanceC．sacrificeD．evaluateC
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(答案→)C
解析：本文的主要内容是，气候变暖不会使亚马逊古代树种灭绝。
【小题1】C。publish为发表之意，其他意思不符合。
【小题2】B。一些树种并未随气温的升高而灭绝，因此超高的树龄令人惊讶。
【小题3】D。该空所表明的事实是以前面的树龄为依据的，所以是“因此”的意思。
【小题4】C。2100是将来的时间，预测符合意思。
【小题5】B。亚马逊的树曾经在高温气候中生存下来，所以将来也很有可能升高的气候。
【小题6】B。Although引导让步状语。
【小题7】A。气温的升高。
【小题8】D。remend此处是建议的意思，后面的should表明这一层意思。
【小题9】C。防止采伐森林是保护政策的中心。
【小题10】B。先前的观点认为树种灭绝是对相对小幅气温升高的反应。
【小题11】A。最新研究的发现。
【小题12】A。过度采伐威胁亚马逊的未来。
【小题13】B。耐高温之意。
【小题14】D。农业和矿业，A、B与agriculture同一范畴，C毫不相干；最后一段有提示。
【小题15】B。没有人类影响，物种移动更为自由。
【小题16】A。今天的气温升高速度远远快于以前，因此难以与过去相对比。
【小题17】C。更为清楚的了解亚马逊森林面临的风险。
【小题18】B。得出的结论。
【小题19】D。积极的行动和措施。
【小题20】A. 保护，使…安全。