刘文静字肇仁，倜傥有器略。大业末，为晋阳令，与晋阳宫监斐寂善。寂夜见逻堞传烽，咤曰：“天下方乱，吾将安舍？”文静笑曰：“如君言，豪英所资也。吾二人者可终羁贱乎？”

    高祖为唐公，镇太原，文静察有大志，深自结。既又见秦王，谓寂曰：“唐公子，非常人也，豁达神武，汉高帝、魏太祖之徒欤！”寂未谓然。文静俄坐李密姻属系狱，秦王私入视之。文静喜，挑言曰：“丧乱方剡，非汤、武、高、光不能定。”王曰：“安知无其人哉？今过此，非儿女子姁姁相忧者。世道将革，直欲共大计，试为我言之。”文静曰：“上南幸，兵填河、洛，盗贼蜉结，以万数，须真主取而用之。诚能投天会机，则四海不足定也。今汾、晋避盗者皆在，文静素知其豪桀，一朝号召，十万众可得也。加公府兵数万，一下令，谁不愿从？鼓而入关，以震天下，王业成矣。”王笑曰：“君言正与我意合。”乃阴部署宾客。

    唐公乃开大将军府，以文静为司马。文静请与突厥连和，唐公从之。遣文静使始毕可汗，始毕曰：“唐公兵何事而起？”文静曰：“先帝废冢嗣以授后主，故大乱。唐公，国近戚，惧毁王室，起兵黜不当立者。愿与突厥共定京师，金币、子女尽以归可汗。”始毕大喜，即遣二千骑随文静至，又献马千匹。公喜曰：“非君何以致之？”

    唐公践天子位擢纳言时多引贵臣共榻文静谏曰今率土莫不臣而延见群下言尚称名帝坐严尊屈与臣子均席此王导所谓太阳俯同万物者也。帝曰：“我虽应天受命，宿昔之好何可忘？公其无嫌。”

    文静自以材能过裴寂远甚，又屡有军功，而寂独用故旧恩居其上，意不平。每论政多戾驳，遂有隙。文静妾失爱，告其兄上变，遂下吏。帝遣裴寂、萧瑀讯状。帝杀之，年五十二。

（节选自《新唐书·刘文静传》，有删改）

    What is the strongest part of your body? Your head? Bones? It's your teeth! There is a special thing called enamel (牙釉质) in teeth. It is the hardest thing in the human body and keeps bacteria (细菌) away. However, teeth are vulnerable (易受伤害的) to problems and disease. September 20 is National Teeth-loving Day in China. Let's pay attention to the health of our teeth.
    Tooth     (1)   are    (1)   around the world. Most children and young adults have tooth decay (龋齿). A study published on China Health Monthly magazine this year showed that 40.74 percent of a sample (抽样) of 1,306 Chinese students under age 15 had decayed teeth.
(2)Food that is rich in sugar increases the risk of tooth decay. After you eat, bacteria go crazy over the sugar on your teeth, like ants at a picnic. The bacteria turn sugar into acids (酸) that eat away at tooth enamel.This cause holes in your teeth.
    Another common problem is crooked teeth (龅牙). When your new teeth begin to grow and the old teeth haven't fallen out, there isn't enough space for the new ones. This causes crooked teeth.
    Don't worry. Here are some ways to keep your teeth healthy.
    Brush at least twice a day – in the morning and before bedtime.
    Learn to use dental floss (牙线). The floss gets rid of food that's hidden where your toothbrush can't get it.
    Visit a dentist. He or she can check if you have any dental problems and help you clean your teeth.
    Pay attention to what you eat. It is better to eat lots of fruits and vegetables instead of fries and drink water instead of soda.
    Wear braces (牙套) to make your teeth straight and beautiful.

下三图分别表示两种生物种群随时间推移而发生的数量变化。那么甲、乙、丙三图分别表示的关系依次是 （  ）