Many people cannot start their day without first having a cup of coffee or tea．These drinks help them think clearly and feel more awake．This is because of caffeine，which helps to give a jump start to the nervous system．Now，a report says it may also boost long-term memory．
Mike Yassa is a neurobiology professor．He and other researchers wanted to know if caffeine could improve a person’s memory．He explains，“After you learn anything，it takes some time for that memory to strengthen．And over the first 24 hours is actually where most of   the forgetting happens．So that is where we wanted to intervene with caffeine and see if we can help reduce this forgetting．”  
They took 160 caffeine-free people and showed them pictures of everyday objects. These people were asked if the objects could be found inside the house， or outdoors．Then some of the subjects were given a caffeine pill．The others were given a placebo—a pill containing nothing. 24 hours later，the subjects were shown the exact same images from the day before．They were also shown images with slight differences，and some completely new images. Both groups correctly identified the exact same and completely new pictures．But those who took the caffeine pill were better at spottingthe pictures that were slightly different．
Professor Yassa says their answers helped to show the effects of caffeine on memory. And  we find that if they are on caffeine they are much more likely to make the right decision．”
The amount of caffeine the researchers used in the study was similar to one cup of strong coffee．The researchers did not see any improvement to memory from smaller doses of caffeine or when it was given an hour before viewing the images．
小題1:What is the focus of the text?   
A．Caffeine can make people addicted．
B．Caffeine can make people energetic.
C．Caffeine can improve long—term memory．
D．Caffeine can make people feel comfortable．
小題2:What does the third paragraph mainly talk about?
A．How the experiment was conducted．
B．Who took part in the experiment．
C．Which group of subjects did better．
D．What was used in the experiment．
小題3:In which section of a magazine can we read this text?
A．Culture．B．Technology．C．Health.D．Education.
小題4:Which of the following statements is NOT true?
A．Most forgetting occurs within the first 24 hours．
B．Forgetting can be positively affected by caffeine．
C．The subjects were given different pills．
D．Yassa was disappointed with the result．
小題5:What can we learn from the last paragraph?
A．More caffeine means better memory．
B．Smaller doses of caffeine doesn’t work．
C．The time to take cafieine doesn’t matter．
D．Caffeine is taken before the experiment．

小題1:C
小題2:A
小題3:C
小題4:D
小題5:B
本文主要告訴我們咖啡因除了可以振奮我們的精神以外，對(duì)我們的長期記憶也是有很好的促進(jìn)作用，文章中作者列舉了與此有關(guān)的一個(gè)實(shí)驗(yàn)的情況。
小題1:C
【試題解析】主旨大意題。根據(jù)文章第一段最后一句This is because of caffeine，which helps to give a jump start to the nervous system．Now，a report says it may also boost long-term memory．可知本文主要講述的是咖啡因能夠有助于人們的長期記憶，敘述與此有關(guān)的實(shí)驗(yàn)的情況。故C正確。
小題2:A
【試題解析】推理題。根據(jù)本段2,3行Then some of the subjects were given a caffeine pill．The others were given a placebo—a pill containing nothing. 24 hours later，the subjects were shown the exact same images from the day before．可知本段是在敘述這個(gè)實(shí)驗(yàn)的具體流程和做法，所以本段是關(guān)于實(shí)驗(yàn)如何被操作的。故A正確。
小題3:C
【試題解析】推理題。本文主要講述的是咖啡因不僅可以讓我們的精神興奮起來，而且對(duì)我們的長期記憶也是有很大的好處的，所以本文是關(guān)于健康類短文短文，也就是說C項(xiàng)正確。
小題4:D
【試題解析】推理題。根據(jù)倒數(shù)第二段Professor Yassa says their answers helped to show the effects of caffeine on memory. And  we find that if they are on caffeine they are much more likely to make the right decision．可知他認(rèn)為這個(gè)研究的結(jié)果能夠反應(yīng)咖啡因?qū)θ说挠洃浀挠绊�，說明這個(gè)實(shí)驗(yàn)是有作用的。也就是說D項(xiàng)說法是錯(cuò)誤的。
小題5:B
【試題解析】推理題。The researchers did not see any improvement to memory from smaller doses of caffeine or when it was given an hour before viewing the images．可知?jiǎng)┝枯^小的咖啡因?qū)θ说挠洃洓]有太多的改善，這樣的研究在實(shí)驗(yàn)里沒有體現(xiàn)出來。故B正確。
【長難句解析】
Many people cannot start their day without first having a cup of coffee or tea。
【翻譯】如果沒有一杯咖啡或者一杯茶，很多人都無法開始一天的工作。
【分析】本句中的介詞without如果沒有…；表示上下文的條件，相當(dāng)于一個(gè)條件狀語從句：if  they don’t have a cup of coffee or tea.
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