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M3U1FogWarningWhenPollylefthomethatmorning,thecitywasalreadycoveredinagreymist.Atlunch,theradioforecastthatthemistwouldbecomeathickfogintheafternoon.Atfouro’clock,Pollyleftworkandsteppedoutintothefog.Shewonderedifthebuseswouldstillberunning.NobusestoKingStreetOnceoutinthestreet,shewalkedquicklytowardsherusualbusstop.‘Howfarareyougoing?’thebusconductoraskedherbeforehetookherfare.‘KingStreet,’saidPolly.‘Sorry,Miss,’repliedtheman,‘thetruthisthatitistoofoggyforthebustorunthatfar.TaketheUndergroundtoGreenPark.Theweathermightbebetterthereandyoumightbeabletogetataxi.’AtallmanAsPollyobservedthepassengersonthetrain,shehadafeelingthatshewasbeingwatchedbyatallmaninadarkovercoat.AtlastthetrainarrivedatGreenParkstation.Whiletherestofthepassengersweregettingout,sheglancedatthefacesaroundher.Thetallmanwasnowheretobeseen.FootstepsWhenPollygottothestationentrance,itwasempty.Outside,wherevershelookedthefoglaylikeathick,greycloud.Therewasnooneinsight.PollysetofftowardsParkStreet.Asshewalkedalongthenarrowstreet,sheheardthesoundoffootstepsapproaching,butbythetimeshereachedthecornerofthestreet,thefootstepsweregone.SuddenlyPollyfeltaroughhandbrushhercheek,andsheheardaman’svoiceinherearsaying‘Sorry.’Themanmovedaway.Shecouldfeelherheartbeatingwithfear.ThehelpfulstrangerThensheheardthesoundagain—softfootstepsbehindher.Aminutebefore,shehadwishedforsomeonetocomealong.Nowshewantedtorun,butfearheldherstill.Thefootstepsseemedclosenow.Thenaman’svoicecameoutofthedarkness.‘Isanybodythere?’Pollyhesitated.Atlastsheanswered,‘Hello,IthinkI’mlost.’Afewsecondslater,ahandreachedoutandgraspedherarm.Pollyfoundherselfstaringupatthefaceofanoldmanwithabeard.‘MaybeIcanhelpyou.Whichroaddoyouwant?’heasked.‘Iliveat86KingStreet,’Pollyreplied.‘Justtakemyhand,’saidtheman.‘Comewithme.You’llbeallright.’HetookPolly’shand.‘Watchoutforthestephere.’Inhisotherhandthemancarriedastick.Pollyheardithitthestep.‘Icanremembersometerriblefogs,butmaybethatwasbeforeyourtime.Ican’tseeyourface,butyousoundyoung.Howoldareyou?’‘Justtwenty,’answeredPolly.‘Ah,twenty!Aniceagetobe.Iwasyoungonce.Nowwe’reatthecrossroads.Turnlefthere.’‘I’mquitelostnow.Areyousureyouknowtheway?’Pollywasbeginningtofeelfrightenedagain.‘Ofcourse.Youreallyshouldn’tfeelanxious.’Heheldherhandmorefirmly.Thegratefulhelper‘Hereweare.KingStreet.’Hestopped.‘Thankyousomuchforcomingtomyaid,’saidPollyinrelief.‘Wouldyouliketocomeinandrestforawhile?’‘It’sveryniceofyou,’saidtheman,‘butI’llbeoff.Theremaybemorepeoplelosttoday,andI’dliketohelpthem.Yousee,afogthisbadisrare.Itgivesmethechancetopaybackthehelpthatpeoplegivemewhenit’ssunny.Ablindpersonlikemecan’tgetacrosstheroadwithouthelp,exceptinafoglikethis.’雾雾警报那天早上当波莉离开家，城市已经被一层灰色的薄雾覆盖。在午餐时间，收音机天气预报员报道薄雾在下午会变成浓雾。四点钟，波莉离开工作，踏入雾中。她怀疑巴士是否仍然在运行。没有去国王街的巴士她一出来在大街上，就快速走向她以往的停车站。“你要去的地方有多远？”巴士售票员问她。“国王街。”波莉回答。“对不起，小姐。”男人回答，“事实上，雾太浓了以至于巴士不能行驶那么远。坐地铁列车去绿色花园，那里的天气也许会好一点，而且你也许可以在哪儿拦到一辆出租车。”一个高大的男人当波莉观察地铁上的乘客时，她注意到她被一个穿着黑色外套的高大男人盯着。最后，列车到达了绿色花园车站。当其他的乘客下车，她扫视了周围人的脸，四处都找不到那个高大男人。脚步声波莉到了车站出口，那里空无一人。外面的雾像一朵厚厚的灰云。在势力范围内一个人都没有。波莉朝着公园街出发。当她沿着街走时，她听到了脚步声，但是等到她到达街道拐角处，脚步声不见了。突然，波莉感到一只粗糙的手轻拂过她的脸，她听到一个男人的声音在她耳边说：“对不起。”男人离开了。她能感觉到心脏带着恐惧的跳动声。乐于助人的陌生人然后她再次听到了这个声音——在她后面轻轻的脚步声。一分钟前，她希望有个人和她一起走。现在她想要跑，但是恐惧使她一动不动。现在脚步声似乎靠近了。然后一个男人的声音从黑暗中传来：“有人在那里吗？”波莉顿了顿，最后她说：“你好，我想我迷路了。”几分钟后，一只手伸了出来而且碰到了她的手臂。波莉发现她自己抬头凝视着一个手停留在她的手臂上站立着的男人。她看到的是一张老人的脸。“也许我能帮助你，你要去哪里？”他问。“我住在国王街86号。”波莉回答。“只管抓住我的手。”男人说，“跟着我走。你会没事的。”他抓住波莉的手：“留意这里的台阶。”在他的另外一只手上男人拿着一根拐杖。波莉听到拐杖敲击着台阶。“我还记得一些可怕的雾天，但是也许那是在你出生之前。我看不见你的脸，但是你的声音听起来很年轻。你几岁了？”“刚满20。”波莉说。“嗯，20岁！一个很美好的年龄。我也曾经年轻。现在我们在拐角处。从这里向左拐。”“我现在快迷路了，您确定您认识路吗？”波莉再次开始感到害怕。“当然，你真的不必担心。”他握住她的手更紧了。一个感恩的帮助者“我们到了，国王街。”他停住。“非常感谢。”波莉说，“你愿意进来休息一下吗？”“你真的很善良。”男人说：“但是我要离开了。今天也许会有更多的人迷路，我要去帮助他们。你看，如此糟糕的雾是很罕见的。它给了我们报答在晴天给我们帮助的人们。一个像我这样的盲人没有帮助时不能穿过马路的，除了在像这样的雾天中。”M3u1ProjectSharkattaksTherearenearly400differenttypesofsharks,butonlyabout30typesareknowntohaveattackedhumanbeings.Manypeopleknowthatthemostdangeroussharkisthegreatwhiteshark,probablybecausetheyhaveseenthefilmJaws.However,twoothersharksarealsoratherdangerous:thetigersharkandthebullshark.Toreducetheriskofasharkattack,youshouldfollowthesesuggestions.•Donotswiminthedark.Sharkscanstillseeyoubutyoucannotseethem.•Donotgoswimmingintheoceanifyouhaveafreshwound.Sharkscansmellbloodoveralongdistance.•Donotwearbrightclothingorjewellery,becausesharksareattractedtotheflashofcoloursandbrightobjects.•Stayingroups,assharksusuallyavoidlargenumbersofpeople.Recently,sharkattackshavebeenincreasingaswatersportsarebecomingmorepopular.Ifasharkattacksyou,followtheadvicebelow.•Keepcalm.Donotpanic.•Hitthesharkonthenosewithyourfist.•Stickyourfingerintheshark’seye.Don’tbefrightenedbysharks:youare30timesmorelikelytobehitbylightningthanbeattackedbyashark.鲨鱼攻击有将近400种不同种类的鲨鱼，但我们知道只有约30种鲨鱼攻击过人类。许多人知道最危险的鲨鱼是大白鲨，也许是因为他们看过电影《大白鲨》吧。然而，另外两种鲨鱼也相当危险：虎鲨和牛鲨。和许多人可能会认为的正好相反，证据显示鲨鱼极少攻击人类。鲨鱼攻击人类的情形有三种。在主要的情形中，鲨鱼攻击你是因为它把你错当成了一条鱼，但当它尝出人肉的味道时，就会决定放弃并游开。在第二种情形中，鲨鱼会用鼻子推搡你，以弄清你是否适合被食用，如果它觉得适合，便会咬你。而在第三种情形中，鲨鱼会等待你游过，然后突然攻击你。后两种攻击类型对人类来说往往是致命的。遵循这些建议，以降低被鲨鱼攻击的风险：不要在黑暗中游泳。在黑暗中，鲨鱼仍能看得见你，而你却看不见它们。如果你有刚受伤的伤口，不要在海洋中游