练习材料：
Experiments have proved that children can be instructed in swimming at a very early age. At a special swimming pool in Los Angeles, children become expert at holding their breath under water even before they can walk. Babies of two months old do not appear to be reluctant to enter the water, It is not long before they are so accustomed to swimming that they can pick up weights from the floor of the pool. A game that is very popular with these young swimmers is the underwater tricycle race. Tricycles are lined up on the floor of the pool seven feet under water. The children compete against each other to reach the other end of the pool. Many pedal their tricycles, but most of them prefer to push or drag them. Some children can cover the whole length of the pool without coming up for breath even once. Whether they will ever become future Olympic champions, only time will tell. Meanwhile, they should encourage those among us who cannot swim five yards before they are gasping for air.
/ɪksˈpɛrɪmənts/ /hæv/ /pruːvd/ /ðæt/ /ˈʧɪldrən/ /kæn/ /biː/ /ɪnˈstrʌktɪd/ /ɪn/ /ˈswɪmɪŋ/ /æt/ /ə/ /ˈvɛri/ /ˈɜːli/ /eɪʤ/. /æt/ /ə/ /ˈspɛʃəl/ /ˈswɪmɪŋ/ /puːl/ /ɪn/ Los /ˈeɪnʤəlz/, /ˈʧɪldrən/ /bɪˈkʌm/ /ˈɛkspɜːt/ /æt/ /ˈhəʊldɪŋ/ /ðeə/ /brɛθ/ /ˈʌndə/ /ˈwɔːtər/ /ˈiːvən/ /bɪˈfɔː/ /ðeɪ/ /kæn/ /wɔːk/. /ˈbeɪbiz/ /ɒv/ /tuː/ /mʌnθs/ /əʊld/ /duː/ /nɒt/ /əˈpɪə/ /tuː/ /biː/ /rɪˈlʌktənt/ /tuː/ /ˈɛntə/ /ðə/ /ˈwɔːtə/, /ɪt/ /ɪz/ /nɒt/ /lɒŋ/ /bɪˈfɔː/ /ðeɪ/ /ɑː/ /səʊ/ /əˈkʌstəmd/ /tuː/ /ˈswɪmɪŋ/ /ðæt/ /ðeɪ/ /kæn/ /pɪk/ /ʌp/ /weɪts/ /frɒm/ /ðə/ /flɔːr/ /ɒv/ /ðə/ /puːl/. /ə/ /geɪm/ /ðæt/ /ɪz/ /ˈvɛri/ /ˈpɒpjʊlə/ /wɪð/ /ðiːz/ /jʌŋ/ /ˈswɪməz/ /ɪz/ /ði/ /ˈʌndəˈwɔːtə/ /ˈtraɪsɪkl/ /reɪs/. /ˈtraɪsɪklz/ /ɑː/ /laɪnd/ /ʌp/ /ɒn/ /ðə/ /flɔːr/ /ɒv/ /ðə/ /puːl/ /ˈsɛvn/ /fiːt/ /ˈʌndə/ /ˈwɔːtə/. /ðə/ /ˈʧɪldrən/ /kəmˈpiːt/ /əˈgɛnst/ /iːʧ/ /ˈʌðə/ /tuː/ /riːʧ/ /ði/ /ˈʌðər/ /ɛnd/ /ɒv/ /ðə/ /puːl/. /ˈmɛni/ /ˈpɛdl/ /ðeə/ /ˈtraɪsɪklz/, /bʌt/ /məʊst/ /ɒv/ /ðɛm/ /priˈfɜː/ /tuː/ /pʊʃ/ /ɔː/ /dræg/ /ðɛm/. /sʌm/ /ˈʧɪldrən/ /kæn/ /ˈkʌvə/ /ðə/ /həʊl/ /lɛŋθ/ /ɒv/ /ðə/ /puːl/ /wɪˈðaʊt/ /ˈkʌmɪŋ/ /ʌp/ /fɔː/ /brɛθ/ /ˈiːvən/ /wʌns/. /ˈwɛðə/ /ðeɪ/ /wɪl/ /ˈɛvə/ /bɪˈkʌm/ /ˈfjuːʧər/ /əʊˈlɪmpɪk/ /ˈʧæmpiənz/, /ˈəʊnli/ /taɪm/ /wɪl/ /tɛl/. /ˈmiːnˈwaɪl/, /ðeɪ/ /ʃʊd/ /ɪnˈkʌrɪʤ/ /ðəʊz/ /əˈmʌŋ/ /ʌs/ /huː/ /ˈkænɒt/ /swɪm/ /faɪv/ /jɑːdz/ /bɪˈfɔː/ /ðeɪ/ /ɑː/ /ˈgɑːspɪŋ/ /fɔːr/ /eə/.
任务配置：L0+L4
知识笔记：
Hold their breath 屏住呼吸
Tricycle /ˈtraɪsɪkl/ 三轮车
Line up 整齐排列
Pedal vi.踩踏板；骑车
Gasping for air 气喘吁吁
练习感悟：继续补作业
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