10.Ebola may not be a deadly disease for everyone,after scientists discovered that some people are likely to be naturally immune(有免疫力酌 )to the virus.
A study in mice showed that genetic variations (基因变异) govern how ill victims will get after contracting the disease.Some completely resist the disease,while others have a slight effect.However,many still suffer from bleeding,organ failure and shock.
The rese.arch was conducted in a highly secure,top-level bio lab in Montana,US.Researchers found that all mice lost weight in the first few days after infection.However,nearly one in five of the mice not only survived,but also fully regained their lost weight within two weeks.
After a fortnight they had no evidence of the disease and their livers looked normal.One
in nine of the mice were partly resistant and less than half of these died.But seventy percent of the mice had a greater than 50percent death rate.
The authors believe that those who have survived during the recent outbreak in West Africa may have had natural immunity."Our data suggests that genetic factors play a significant role in disease outcome,"said co-author Dr Michael Katze,of Washington University's Department of Microbiology.
"We hope that medical researchers will be ahle to rapidly apply these findings to candidate therapeutics and vaccines(疗法和疫苗)."
28.According to the passage,the degree of the victims'disease is determined byB.
A.their weight B.genetic factors
C.natural immunity D.their resistance
29.What is the symptom of Ebola in the study'?A
A.All the mice lost weight.
B.The mice all began to bleed.
C.All the mice suffered organ failure.
D.The mice all gained weight.
30.Which of the follou'ings is true in the research?B
A.Seventy percent of the mice died.
B.About twenty percent of the mice survived.
C.The death rate of the mice is over 50percent.
D.The mice that are resistant account for 10percent.
31.What does the author mainly discuss in the passage?A
A.Ebola doesn't necessarily lead to death.
B.A research on Ebola in mice was conducted.
C.Genetic variations play a significant role in disease outcome.
D.The researchers will rapidly find therapeutics and vaccines.
分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了Ebola不一定会导致死亡,研究人员将其研究成果应用于候选治疗药物和疫苗.
解答 28.B.细节理解题.根据最后一段:Our data suggests that genetic factors play a significant role in disease outcome可知遗传因素在疾病的转归起着重要的作用;故选B.
29.A.细节理解题.根据第三段:Researchers found that all mice lost weight in the first few days after infection可知研究中埃博拉病毒的症状是所有的老鼠体重减轻了;故选A.
30.B.细节理解题.根据第三段:However,nearly one in five of the mice not only survived,but also fully regained their lost weight within two weeks可知大约有百分之20的小鼠存活了下来;故选B.
31.A.主旨大意题.根据第一段:Ebola may not be a deadly disease for everyone,after scientists discovered that some people are likely to be naturally immune(有免疫力酌 )to the virus可知文章主要讲了Ebola不一定会导致死亡,研究人员将其研究成果应用于候选治疗药物和疫苗;故选A.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.