在每年的“中小学弘扬和培育民族精神月”活动中，全国各地都会以爱国主义为核心，开展丰富多彩的宣传教育活动。我国有许多反映中华民族精神基本内涵的诗词格言。下列选项中对应正确的是（   ）

①自强不息——老骥伏枥，志在千里；烈士暮年，壮心不已

②爱好和平——犯强汉者，虽远必诛

③勤劳勇敢——春夏耕耘，冬秋收藏，昏晨力作，夜以继日

④团结统一——千磨万击还坚劲，任尔东西南北风

若a₁=1，a₂= ，a₃= ，a₄=2，…，按此规律在a₁到a₂₀₁₄中，共有无理数____个．

阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

    Until recently daydreaming was viewed as a waste of time or it ____ (consider) an unhealthy escape from real life and its duties．But now some people are taking a fresh look at daydreaming．Some think it may be a very ____ (health) thing to do．Some researchers are finding that daydreaming may be important to mental health．Daydreaming, they tell us, ____ a good means  of relaxation．But its benefits go____ this．A number of psychologists have conducted experiments and have reached some____ (surprise) conclusion．

    Dr．Joan T．Freyberg has concluded that daydreaming contributes growth．It also improves____ (concentrate),attention span, and the ability to get along with others．Industrialist Henry J．Kaiser believed that much of his success was due____ the positive use of daydreaming．Florence Nightingale dreamed of becoming a nurse．The young Thomas Edison pictured____ as an inventor．

    For these notable achievers, it appears that their daydreams came  ____．Dr Harry Emerson Fosdick offered this advice: “Hold a picture of yourself…in your mind's eye, and you will be drawn toward it．Picture yourself ____ (vivid) as defeated and that alone will make victory impossible．

对人来说，子代的性别主要决定于亲代的（    ）