最新职称英语考试理工B完形填空试题
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第6部分：完形填空
Warmer Climate Will Bake TropicalBugs
Globalwarming could cook tropical insects, with unpredictable knock-on effects, sayresearchers who warn that rising temperatures also______51 tropical frogs,lizards 蜥蜴.
Temperaturesare ______ 52 to increase much faster in temperate温和的` andpolar极地的regions than in the tropics. But no-one had looked at how warming would affectinsects and other cold-blooded animals ______ 53 had evolved in tropicalregions with little temperature variation.
CurtisDeutsch at the University of California at Los Angeles and colleagues analyseddata ______ 54 insect survival and reproduction for 38 species in differentecosystems生态系统, andthen estimated how these values would ______ 55 with predictions of climatechange for the 21st century.
Theteam found that the reproductive ______ 56 of tropical insects tends to peakvery close to the temperatures where they normally live, but______ 57 sharplyat higher temperatures. This means that cranking up 提高theheat only a small amount can exert a heavy toll, leaving insects unable toreproduce ______ 58 enough to keep up their numbers.
Temperaturetolerance
Temperateinsects reproduce well over a broader range, and do not live as ______ 59 totheir thermal热的limit, so they can reproduce successfully when their climate warms more than inthe tropics.
“Tropicalinsects do very well in a narrow band of temperatures, but move them above that______ 60 and they die,” says team member Josh Tewksbury of the University ofWashington in Seattle.
Theheart of the ______ 61 is temperature tolerance. emperate-zone insects haveevolved to survive the much broader temperature swings of seasonal climates,than have their tropical relatives.
The______ 62 appears worse for animals that live in hot stable climate of thelower levels of tropical forests. Lizards in clear areas can find shade to cooldown, but those living in the forest are already in the ______ 63, andthere's not much they can do to get cooler, Deutsch says.
Too fewtropical insects have been studied so far to ______ 64 if any particulargroup will be particularly hard-hit, says Tewksbury. Insects play important______ 65 in forest ecology生态学, including pollination, and eatingdetritus to recycle carbon.
Theteam are now starting to evaluate how temperature affects ecologicalinteractions of insects with other species, including crops such as Africancorn.
参考答案：
51 threaten 52 expected 53 that 54 on 55 change
56 rate 57 drops 58 sucessfully 59 close 60 range
61 problem 62: effect 63 shade 64 tell 65 roles