高三限时训练题.doc

2015年1月高三英语限时训练 New genetic analysis has revealed that many Amazon tree species are likely to survive human-made climate warming in the coming century, contrary to previous findings that temperature increases would cause them to die out. A study, 36 in the latest edition of Ecology and Evolution, reveals the 37 age of some Amazonian tree species -- more than 8 million years -- and 38 shows that they have survived previous periods as warm as many of the global warming imagined periods 39 for the year 2100. The authors write that, having survived warm periods in the past, the trees will 40 survive future warming, provided there are no other major environmental changes. 41 extreme droughts and forest fires will impact Amazonia as temperatures 42 , the trees will stand the direct impact of higher temperatures. The authors 43 that as well as reducing greenhouse gas emissions to minimize the risk of drought and fire, conservation policy should remain 44 on preventing deforestation for agriculture and mining. The study disagrees with other recent researches which predicted tree species’ extinctions 45 relatively small increases in global average air temperatures. Study co-author Dr Simon Lewis (UCL Geography) said the 46 were good news for Amazon tree species, but warned that drought and over-exploitation of the forest remained major 47 to the Amazon’s future. Dr Lewis said: “The past cannot be compared directly with the future. while tree species seem likely to 48 higher air temperatures than today, the Amazon forest is being transformed for agriculture and 49 , 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 50 . Similarly, today’s climate change is extremely fast, making comparisons with slower changes in the past 51 .” “With a cle