题目内容
2.During the outbreak of 2009-2010 H1N1 or"swine flu",the same virus that caused mild coughing and sneezing in some patients proved deadly for others.It highlighted a medical mystery:why are some people more fit to handle the flu than others?British and American researchers think they have a clue.Reporting on Sunday in the journal Nature,researchers say they've found a gene that influences our ability to fight against flu illness.The gene,called IFITM3,is the"important first line of defense"against the flu,researcher Paul Kellam of Britain's Sanger Institute told Reuters.
The IFITM3 protein(蛋白) prevents flu viruses from reproducing in cells.So,if you have a high amount of IFITM3,you're in luck,since it weakens the spread of the virus; a low amount can lead to more rapid viral reproduction,causing severe flu symptoms,according to Kellam.
Scientists first found in gene studies that IFITM3played a role in resistance to flu and other viruses.In experiments in mice,they showed that when mice were raised to lack the IFITM3gene and then infected with influenza,the animals developed more severe lung infection from flu,compared with mice that had the gene.
To figure out the role of IFTTM3 in humans,researchers then studied the IFITM3genes of 53patients with the flu in 2009-2010.They found that these patients were more likely to have a variant of the IFITM3gene-which makes people more vulnerable to flu-compared with the general population.According to evidence from large genetic databases,about 1in 400people carries this IFITM3variant,the BBC reports.
"Our research is important for people who have this variant as we predict their immune defenses could be weakened to some virus infections,"said Kellam.
The Findings also suggest that a drug that functions as IFITM3could help increase resistance to flu and other viruses,including deadly ones like H5N1flu.
63.What does the underlined word'vulnerable'mean in the fifth paragraph?D
A.resistant B.accessible C.adjustable D.defenseless
64.You are less likely to get infected with H1N1ifD
A.a variant of EFIM3is produced
B.the immune system is weakened
C.protein doesn't function in your cells
D.you have a high amounts of IFITM3
65.Which of the following can serve as the best title of the passage?A
A.Why Flu Hits Some People Harder
B.How We Protect Ourselves From Flu
C.How We Get Infected With Flu
D.Why Flu Breaks Out Among People.
分析 文章介绍了为什么有些人得了流感恢复得很快,科学家发现这类人体内有IFITM3蛋白,形成了一道防线.这一发现已经被应用到药物上来防止流感.
解答 63.D.细节理解题.由第六段Our research is important for people who have this variant as we predict their immune defenses could be weakened to some virus infections,可知实验发现感染变体病毒的人,他们的免疫防御系统可能会削弱某些病毒感染.defenseless无抵抗力的,故选D.
64.D.细节理解题.由最后一段IFITM3could help increase resistance to flu and other viruses,including deadly ones like H5N1flu可知,药物IFITM3可以抗H1N1病毒,因此体内有许多IFITM3时不会感染H1N1.故选D.
65.A.主旨大意题.由全文内容可知,文章主要介绍了为什么有些人得了流感恢复得很快.故选A.
点评 关于科教类阅读中的一些专业词语或生词,考生要学会略过某些对阅读影响不大的词.如果必须要弄清它的意思,则可以根据词形进行判断,或者从该词在句子中的功用以及与其他词语之间的关系猜测生词的意思.也可根据上下文和其他词语的按时猜测生词的含义.
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| 16.A.nuts | B.cigarette | C.seeds | D.coins |
| 17.A.school | B.bank | C.home | D.market |
| 18.A.cashier | B.teacher | C.buyer | D.doctor |
| 19.A.son's | B.daughter's | C.grandson's | D.father's |
| 20.A.but | B.so | C.thus | D.and |
| 21.A.left | B.took | C.searched | D.liked |
| 22.A.gone | B.stolen | C.broken | D.sold |
| 23.A.which | B.when | C.where | D.when |
| 24.A.words | B.language | C.books | D.money |
| 25.A.little | B.active | C.significant | D.alternative |
| 26.A.easy | B.smooth | C.rough | D.wrong |
| 27.A.hated | B.refused | C.continued | D.wanted |
| 28.A.left | B.sent | C.looked | D.carried |
| 29.A.strange | B.angry | C.depressed | D.disappointing |
| 30.A.desk | B.spot | C.jar | D.bed |
| 31.A.covered | B.full | C.agreed | D.content |
| 32.A.When | B.As | C.With | D.After |
| 33.A.looked down | B.shut up | C.looked up | D.knelt down |
| 34.A.doubted | B.wondered | C.guessed | D.knew |
| 35.A.say | B.speak | C.tell | D.talk |
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| 37.A.address | B.number | C.ticket | D.invitation |
| 38.A.quickly | B.completely | C.quietly | D.excitedly |
| 39.A.lovely | B.popular | C.confident | D.ordinary |
| 40.A.cover up | B.turn off | C.dress up | D.take in |
| 41.A.hall | B.party | C.theatre | D.school |
| 42.A.relieve | B.escape | C.relax | D.suffer |
| 43.A.interest | B.ability | C.sense | D.touch |
| 44.A.proper | B.worth | C.good | D.happy |
| 45.A.struggled | B.knocked | C.supported | D.controlled |
| 46.A.Appreciation | B.Attention | C.Expectation | D.Applause |
| 47.A.failing | B.fearing | C.forgetting | D.regretting |
| 48.A.absorbed | B.swallowed | C.interested | D.surrounded |
| 49.A.singing | B.flying | C.skipping | D.staying |
| 50.A.stopped | B.paused | C.ended | D.succeeded |
| 51.A.talked | B.dressed | C.laughed | D.looked |
| 52.A.appearance | B.excitement | C.expression | D.exhibition |
| 53.A.Sorry | B.Congratulations | C.Far from | D.Fantastic |
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| 55.A.doubted | B.realized | C.wondered | D.suggested |