Question

16．A new study says one part of the human brain may become smaller as the result of a condition known as jet lag．Jet lag results from flying long distances in an airplane．Jet lag interferes with a person's normal times for sleeping and waking．People with jet lag may feel extremely tired for several days．They also may have problems thinking clearly and remembering．
Kwangwook Cho is a researcher at the University of Bristol in Britain．He reported the findings of his jet lag study in the publication Nature Neuroscience．
The study involved twenty young women who worked for international airlines．The women had served passengers on airplanes for five years．These flight attendants flew across many countries and at least seven time zones．In the study，the flight attendants had different amounts of time to recover from jet lag．Half the women spent five days or fewer in their home areas between long flights．The other half spent more than fourteen days in their home areas．
Mister Cho took some fluid from the women's mouths to measure levels of a hormone that increases during stress．He tested them to see if they could remember where black spots appeared on a computer screen．And he took pictures of their brains using magnetic resonance imaging．This is a way to measure the size of the brain's temporal lobes（顳葉）．
It was found that the women who had less time between flights had smaller right temporal lobes．This area of the brain deals with recognizing and remembering what is seen．The same group performed worse and had slower reaction times on the visual memory test．And their saliva samples showed higher levels of stress hormones．
Mister Cho says he believes the brain needs at least ten days to recover after a long trip．He says airline workers told him their ability to remember got worse after working on planes for about four years．Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory．
Scientists say more tests are needed to study the effects of jet lag on the brain．They want to find out if too much jet lag could permanently affect memory．
72．According to the text，jet lagD．
A．can cause difficulties in speaking
B．can make people feel tired for a few weeks
C．is the illness only found in people who work on the airplanes
D．can be caused by flying over several time zones in an airplane
73．It is inferred that more tests need to be done becauseC．
A．the conclusion was questioned by many scientists
B．scientists fear that his research is not done properly
C．every scientific conclusion needs the support from many tests
D．the woman who were studied in the research were not healthy
74．Which of the following statements is TRUE about the research results？A
A．Women who have a longer rest at home show better memory．
B．Women who fly in short time had smaller right temporal lobes．
C．Women who have longer flights failed the memory test．
D．Women who rest more than 14 days produced less hormones．
75．What is the subject discussed in the test？C
A．The cause of jet lag．
B．A story of a group of flight attendance．
C．A research about the effects of jet lag on the brain．
D．The importance of having enough rest after long flights．

Answer 1

分析 這是一篇科普文章，是科學家對于飛行時差反應對人腦的影響所做的實驗．

解答 72-75．DCAC
73題答案：D考查細節(jié)推理，根據(jù)文章第一段Jet lag results from flying long distances in an airplane．People with jet lag may feel extremely tired for several days．"飛行時差是源于長距離的飛行，有飛行時差的人一連幾天會感到極其疲憊"，可知本題答案為D．
74題答案：C考查細節(jié)推理，根據(jù)最后一段Scientists say more tests are needed to study the effects of jet lag on the brain．科學家說需要更多的測試來研究飛行時差對大腦的影響，故答案應為C選項．
74題答案：A根據(jù)文章倒數(shù)第二段He says airline workers told him their ability to remember got worse after working on planes for about four years．他說航空工作人員告訴他他們的記憶能力在飛機上工作大約四年后會變差，可知A符合題意．
75題答案：C考查細節(jié)推理，根據(jù)Scientists say more tests are needed to study the effects of jet lag on the brain．可知本題答案為C選項．

點評 一般情況下科普類文章是閱讀理解題的難點，它們生詞多、專業(yè)術(shù)語多，理解難度比較大．對于這類文章我們要靜下心來，先略讀，通讀全文，對文章大意有個模糊理解，然后看題目，再帶著題目細讀文章，找到答題依據(jù)，得出正確答案．