JJ英语衡水金卷高三最新24届先享题信息卷试卷一
紧张的高三，当各学科复习试卷像潮水一样汹涌而来，每一名学生都会或多或少地产生对学习的厌倦情绪。但是对于试卷，学生要非常重视并且利用好。因为这一张张试卷都是各学科老师精心挑选的，每道试题都很有代表性，可以强化复习中所需具备的知识和能力。小编今天整理了全国各省市高三各类试题供广大考生参考。
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Amphibians are animals that can live both on land and in water.A new globalassessment has found that 41%of amphibian species that scientists have studied arethreatened with extinction.That's up from 39%reported in the last assessment in 2004.
The study,published on Wednesday in the journal Nature,found that the loss of habitat
from the legal and illegal expansion of farming and ranching(放牧)contributes most to theextinction risk of amphibians worldwide.But a growing percentage of amphibian species arenow also pushed to the edge of extinction by novel diseases and climate change,the studyfound,
Amphibians have distinct life stages that each often require separate habitats,so theycan be disturbed by changes in either water or land environments,said University of Texasbiologist Michael Ryan,who was not involved in the study.They are also at risk because oftheir delicate skin.Most amphibians absorb oxygen to breathe through their skin,and so theydo not have scales(鳞),feathers or fur to protect them.Chemical pollution,bacteria andfungal(真菌的)infections impact them quickly,as do heightened swings in temperatureand dampness levels due to climate change.
For example,frogs are active usually at night.If it's too hot,they won't come out evenat night because they would lose too much water through their skin,said co-author andresearcher Patricia Burrowes.But remaining in sheltered resting places limits frogs'ability toeat and to produce.
Juan Manuel Guayasamin,a frog biologist at the University San Francisco of Quito,Ecuador,said that advances in technology to track animals and climate variations allowed thenew study to use much more precise data than the 2004 assessment.“We have a much betterunderstanding of some risks,”said Guayasamin.
The study identified the greatest concentrations of threatened amphibian species in severalbiodiversity hot spots,including the Caribbean islands,the tropical Andes,Madagascar andSri Lanka.Other locations with large numbers of threatened amphibians include Brazil'sAtlantic Forest,southern China and the southeastern United States.
28.What has the new study found?
A.Amphibian populations are now extinct.
B.The number of amphibians is rising slightly.
C.The extinction risk of amphibians has declined.
D.More amphibian species are endangered than before.
29.Which of the following is the single biggest threat to amphibians?
A.Habitat loss.B.Illegal hunting.
C.Novel diseases.D.Climate change.
JJ英语衡水金卷高三最新24届先享题信息卷试卷一