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 (基因變異) 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.a(chǎn)rch 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(療法和疫苗)."
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 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了Ebola不一定會導致死亡,研究人員將其研究成果應(yīng)用于候選治療藥物和疫苗.
解答 28.B.細節(jié)理解題.根據(jù)最后一段:Our data suggests that genetic factors play a significant role in disease outcome可知遺傳因素在疾病的轉(zhuǎn)歸起著重要的作用;故選B.
29.A.細節(jié)理解題.根據(jù)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癥狀是所有的老鼠體重減輕了;故選A.
30.B.細節(jié)理解題.根據(jù)第三段:However,nearly one in five of the mice not only survived,but also fully regained their lost weight within two weeks可知大約有百分之20的小鼠存活了下來;故選B.
31.A.主旨大意題.根據(jù)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可知文章主要講了Ebola不一定會導致死亡,研究人員將其研究成果應(yīng)用于候選治療藥物和疫苗;故選A.
點評 考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.