正文材料：
Lesson21 Mad or not?
Aeroplanes are slowly driving me mad. I live near an airport and passing planes can be heard night and day. The airport was built years ago, but for some reason it could not be used then. Last year, however, it came into use. Over a hundred people must have been driven away from their homes by the noise. I am one of the few people left. Sometimes I think this house will be knocked down by a passing plane. I have been offered a large sum of money to go away, but I am determined to stay here. Everybody says I must be mad and they are probably right.
任务设置：L0+L1
L0：
/Aeroplanes /ər /ˈsloʊli /ˈdraɪvɪŋ/ mi /mæd/. aɪ/ lɪv/ nɪr /ən /ˈɛrˌpɔrt/ənd /ˈpæsɪŋ /pleɪnz/ kən /bi /hɜrd /naɪt/ ənd /deɪ/. ði /ˈɛrˌpɔrt/wəz /bɪlt /jɪrz/əˈgoʊ/, bət/ fər /səm /ˈrizən/ ɪt /kəd /nɑt /bi /juzd /ðɛn/. læst/ jɪr/, ˌhaʊ/ˈɛvər/, ɪt /keɪm/ ˈɪntə /juz/. ˈoʊvər /ə ˈ/hʌndrəd /ˈpipəl /məst /həv /bɪn/ˈdrɪvən /əˈweɪ/ frəm/ ðɛr /hoʊmz/ baɪ/ ðə /nɔɪz/. aɪ /əm /wʌn /əv /ðə/ fju /ˈpipəl/lɛft/. səmˈtaɪmz/ aɪ /θɪŋk /ðɪs/ haʊs /wɪl /bi/ nɑkt /daʊn/ baɪ /ə/ˈpæsɪŋ /pleɪn/. aɪ/ həv/bɪn /ˈɔfərd /ə /lɑrʤ/ sʌm /əv /ˈmʌni /tə /goʊ /əˈweɪ/, bət /aɪ /əm /dɪˈtɜrmənd/ tə /steɪ/ hir/. ˈɛvriˌbɑdi/sɛz/aɪ /məst/ bi/mæd /ənd/ ðeɪ /ər/ ˈprɑbəbli /raɪt/.
L1:/r/
/r/是r的发音。舌尖齿龈(后部)摩擦辅音。发音时舌尖卷起，靠近上齿龈后部。舌两侧稍收扰。双唇略突出。气流通过舌尖和齿龈形成轻微摩擦。浊辅音，声带振动。
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