5.Malaria (瘧疾),the world's most widespread parasitic (寄生蟲引起的) disease,kills as many as three million people every year-almost all of whom are under five,very poor,and African.In most years,more than five hundred million cases of illness result from the disease,although exact numbers are difficult to assess because many people don't (or can't) seek care.It is not unusual for a family earning less than two hundred dollars a year to spend a quarter of its income on malaria treatment,and what they often get no longer works.In countries like Tanzania,Mozambique,and the Gambia,no family,village,hospital,or workplace can remain unaffected for long.
Malaria starts suddenly,with violent chills,which are soon followed by an intense fever and,often,headaches.As the parasites multiply,they take over the entire body.Malaria parasites live by eating the red blood cells they infect (感染).They can also attach themselves to blood vessels in the brain.If it doesn't kill you,malaria can happen again and again for years.The disease passed on to humans by female mosquitoes infected with one of four species of parasite.Together,the mosquito and the parasite are the most deadly couple in the history of the earth-and one of the most successful.Malaria has five thousand genes,and its ability to change rapidly to defend itself and resist new drugs has made it nearly impossible to control.Studies show that mosquitoes are passing on the virus more frequently,and there are more outbreaks in cities with large populations.Some of the disease's spread is due to global warming.
For decades,the first-choice treatment for malaria parasites in Africa has been chloroquine,a chemical which is very cheap and easy to make.Unfortunately,in most parts of the world,malaria parasites have become resistant to it.Successful alternatives that help prevent resistance are already available,but they have been in short supply and are very expensive.If these drugs should fail,nobody knows what would come next.
27.According to paragraph 1,many people don't seek care becauseA.
A.they are too poor
B.it is unusual to seek care
C.they can remain unaffected for long
D.there are too many people suffering from the disease
28.People suffering from malariaC.
A.have to kill female mosquitoes
B.have ability to defend parasites
C.have their red blood cells infected
D.have sudden fever,followed by chills
29.Which of the following may be the reason for the wide spread of the disease?D
A.Its resistance to global warming.
B.Its ability to pass on the virus frequently.
C.Its outbreaks in cities with large populations.
D.Its ability to defend itself and resist new drugs.
30.Which of the following questions has NOT been discussed in the passage?D
A.How can we know one is suffering from malaria?
B.How many people are killed by malaria each year?
C.Why are there so many people suffering from malaria?
D.What has been done to keep people unaffected for long?

分析 文是一篇科教類閱讀,文章主要介紹了痢疾對人的健康的危害,分析了人們患瘧疾的原因,以及瘧疾廣泛傳染的原因和痢疾的治療方法.但由于新的治療瘧疾的藥物缺乏并且很貴,所以大多數(shù)人不能用新的治療方法治療.

解答 27.A推斷細節(jié)題.根據(jù)第一段中的"It is not unusual for a family earning less than two hundred dollars a year to spend a quarter of its income on malaria treatment,and what they often get no longer works."可知許多人不進行治療的原因是他們太窮,沒有錢治療瘧疾.故選A.
28.C細節(jié)理解題.根據(jù)第二段中的"Malaria parasites live by eating the red blood cells they infect."可知人們患瘧疾的原因是他們的紅血球受到了感染.故選C.
29.D細節(jié)判斷題.根據(jù)第二段中的"Malaria has five thousand genes,and its ability to change rapidly to defend itself and resist new drugs has made it nearly impossible to control."可知瘧疾基因有五千,它能迅速改變來保護自己,并且抵制新型病毒,它的這些能力已變得幾乎不可能被控制.由此可知,瘧疾廣泛傳染的原因是它有保護自己和抵抗新藥的能力.故選D.
30.D 正誤判斷題.根據(jù)短文的內(nèi)容可判斷出短文沒有涉及"做什么來使人們長時間不感染?"故選D.

點評 本文是一個科教類閱讀理解,題目涉及多道細節(jié)理解題,做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析,結(jié)合選項選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測,一定要做到有理有據(jù).

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