In Mayhew’s initial 2008 study，low biodiversity among marine invertebrates(無脊椎動(dòng)物)appeared to coincide with warmer temperatures on Earth over the last 520 million years. But Mayhew and his colleagues decided to reexamine their hypothesis，this time using data that were“a fairer sample of the history of life.”砌this new collection of material.they found a complete reversal of the relationship between species richness and temperature from what their previous paper argued：the number of different groups present in the fossil record was higher，rather than lower，durin9“greenhouse phases.”

　　Their previous findings rested on an assumption that fossil records can be taken to represent biodiversity changes throughout history.Thisn’t necessarily the case.because there are certain periods with higher.quality fossil samples.and some that are much more difficult to sample well.Aware of this bias.Mayhew’s team used data that standardized the number of fossils examined throughout history and accounted for other variables like sea level changes that might influence biodiversity in their new study to see if their old results would hold up.

　　Two years later，the results did not.But then why doesn't life increasingly emerge on Earth as our temperatures get warmer?

　　While the switch may prompt some to assert that climate change is not hazardous to living creatures，Mayhew explained that the timescales in his team’s study are huge--over 500million years--and therefore inappropriate for the shorter periods that we might look at as humans concerned about global wanning.Many global warming concerns are focused on the next century.He said——and the lifetime of a species is typically one to 10 million years.

　　“I do worry that these findings vill be used by the climate skeptic community to say‘look.Climate warming is fine。he said.Not to mention the numerous other things we seem to do to create a storm of threats to biodiversity—think of what habitat(棲息地)destruction，overfishing，and pollution can do for a species’viability(生存力).Those things，Mayhew explained，give the organisms a far greater challenge in coping with climate change than they would have had in the absence of humans.

　　“If we were to relax all these pressures on biodiversity and allow the world to recover over millions of years in a warmer climate.then my prediction is it would be an improvement in biodiversity，”he said.So it looks like we need to curb our reckless treatment of the planet first，if we want to eventually see a surge in the number of species on the planet as temperatures get warmer.We don't have 500 million years to wait.

　　仔細(xì)閱讀強(qiáng)化訓(xùn)練選項(xiàng)：

　　1.What is the finding of Peter Mayhew’s recent study?

　　A.Higher temperature causes the low biodiversity of marine invertebrates.

　　B.Fossil record can represent a relatively believable history of life.

　　C.The number of fossils was higher during greenhouse phases.

　　D.Global warming might promote the richness of species on Earth.

　　2.What do we learn about Mayhew’s previous report?

　　A.It was based on his colleagues hypothesis about global warming.

　　B.It was contrary to what his team found in the recent study.

　　C.It was a complete reversal from his 2008 study about marine invertebrates.

　　D.It found evidence for the connections between biodiversity and temperature.

　　3.Why does Mayhew’s team use data that standardized the number of fossils?

　　A.They realize not all fossils can sample well to represent biodiversity changes.

　　B.They start to consider the variables that might influence biodiversity.

　　C.They want to check the previous findings with different research methods.

　　D.They believe sea level changes can lead to inaccurate fossil records.

　　4.Because of the huge timescales in his study，Mayhew believed .

　　A.global warming is not hazardous t0 1iving creatures in a short time

　　B.his study is not suitable to support short-term global warming

　　C.global warming concerns should be focused on in the next century

　　D.the lifetime of a species can be extended t0 10 million years

　　5.By“we don’t have 500 million years to wait”(Line 4，Para.6)，the author suggests that_____.

　　A.we have no enough time to allow the earth to recover from damages

　　B.we have no enough time to witness the evolution of a species

　　C.it’s urgent for humans to take steps to prevent global warming

　　D.it's necessary for humans to stop maltreatment of the planet

　　仔細(xì)閱讀強(qiáng)化訓(xùn)練答案：

　　1.D)。定位 由題干中的finding of Peter Mayhew’S recent study定位到文章第一段：University of York biologist Peter Mayhew recently found that global warming might actually increase the number of species on the planet…

　　詳解： 事實(shí)細(xì)節(jié)題。本題考查彼得·梅休的最新研究成果。定位句指出，他發(fā)現(xiàn)氣候變暖可能使得地球上物種的數(shù)量增加，故答案為D)。A)“氣溫升高導(dǎo)致海洋無脊椎動(dòng)物生物多樣性降低”，這是梅休2008年最初的研究結(jié)論，故排除;B)“化石記錄能表現(xiàn)出相對(duì)可信的生物發(fā)展歷史”，第三段第一句已經(jīng)指出這是他研究前的假設(shè)而不是結(jié)論，故排除;C)“溫室效應(yīng)階段化石數(shù)量更多”，第二段最后一句指出，是化石中體現(xiàn)的生物物種更多而不是化石本身的數(shù)量更多，故排除。

　　2.B)。定位 由題干中的Mayhew’S previous report定位到文中第二段第三句：With this new collection of material，they found a complete reversal of the relationship between species richness and temperature from what their previous paper argued...

　　詳解：推理判斷題。本題考查對(duì)梅休之前研究報(bào)告結(jié)論的理解。定位句指出，在新收集的材料中，他們發(fā)現(xiàn)了與他們之前的論文所辯稱的一種物種豐富性與溫度間完全相反的關(guān)系，故答案為B)。A)“他的報(bào)告是基于同事對(duì)于氣候變暖的假設(shè)前提下”，文中第二段第二句提到their hypothesis，即是他們的共同假設(shè)，故排除;c)“與他2008年關(guān)于海洋無脊椎動(dòng)物研究結(jié)論完全相反”，梅休之前的研究就是于2008年進(jìn)行的這次研究，無法與自身作比較，故排除;D)“找到了生物多樣性和氣溫之間的關(guān)系的證據(jù)”，由定位句可知是得出了與之相反的結(jié)論，而不是對(duì)其加以證實(shí)，故排除。

　　3.A)。定位 由題干中的data that standardized the number of fossils定位到文章第三段第二、三句：this isn’t necessarily the case，because there are certain periods with higher-quality fossil samples，and some that are much more diffimflt to sample well.Aware of this bias，Mayhew’S team used data that standardized the

　　number of fossils...

　　詳解：推理判斷題。本題考查梅休團(tuán)隊(duì)利用標(biāo)準(zhǔn)化化石的原因。定位句指出，因?yàn)槟承┨囟ǖ臅r(shí)段有一些更高質(zhì)量的化石樣本，其中一些更難取出好的樣本。基于這一點(diǎn)，梅休團(tuán)隊(duì)在他們的新實(shí)驗(yàn)中利用標(biāo)準(zhǔn)化個(gè)數(shù)并被歷史所檢測(cè)的化石數(shù)據(jù)，故本題答案為A)。B)“他們開始考慮一些可能影響生物多樣性的其他變化因素”、C)“他們想用不同的研究方法檢驗(yàn)之前的結(jié)論”和D)“他們相信海平面變化會(huì)導(dǎo)致化石記錄的不準(zhǔn)確性”，文中第三段最后一句指出，他們只是猜測(cè)比如海平面等相關(guān)因素會(huì)影響生物多樣性而想去證實(shí)它，故排除。

　　4.B)。定位 由題干中的the huge timescales in his study定位到文中第四段第三句....Mayhew explained that the timescales in his team’S study are huge--over 500 million years--and therefore inappropriate for the shorter periods that we might look at as humans concerned about global warmin9.

　　詳解：事實(shí)細(xì)節(jié)題。本題考查梅休對(duì)于研究時(shí)間跨度太長(zhǎng)的態(tài)度。定位句指出，梅休解釋他們團(tuán)隊(duì)的研究時(shí)標(biāo)很長(zhǎng)，有5億多年，所以用于解釋人們關(guān)注的較短時(shí)間內(nèi)的全球變暖是不合適的，故答案為B)。

　　A)“氣候變暖短時(shí)間內(nèi)不會(huì)對(duì)生物造成威脅”，文中第四段第三句前半部分指出那是氣候變化質(zhì)疑者的斷言，故排除;C)“氣候變暖的關(guān)注點(diǎn)應(yīng)該集中在下個(gè)世紀(jì)”是陳述的事實(shí)而不是推測(cè)，故排除;D)“一個(gè)物種的壽命可以達(dá)到1千萬(wàn)年”與題干無直接邏輯關(guān)系，故排除。

　　5.D)