练习材料：Lesson 13 The Greenwood Boys（46s）
The Greenwood Boys are a group of pop singers. At present, they are visiting all parts of the country. They will be arriving here tomorrow. They will be coming by train and most of the young
people in the town will be meeting them at the station. Tomorrow evening they will be singing at the Workers' Club. The Greenwood Boys will be staying for five days. During this time, they will give five performances. As usual, the police will have a difficult time. They will be trying to keep order. It is always the same on these occasions.
音标翻译：
ðə ˈgriːnwʊd bɔɪz ɑːr ə gruːp ɒv pɒp ˈsɪŋəz. æt ˈprɛznt, ðeɪ ɑː ˈvɪzɪtɪŋ ɔːl pɑːts ɒv ðə ˈkʌntri. ðeɪ wɪl biː əˈraɪvɪŋ hɪə təˈmɒrəʊ. ðeɪwɪl biː ˈkʌmɪŋ baɪ treɪn ænd məʊst ɒv ðə jʌŋ
ˈpiːpl ɪn ðə taʊn wɪl biː ˈmiːtɪŋ ðɛm æt ðə ˈsteɪʃən. təˈmɒrəʊ ˈiːvnɪŋ ðeɪ wɪl biː ˈsɪŋɪŋ æt ðə ˈwɜːkəz klʌb. ðə ˈgriːnwʊd bɔɪz wɪl biːˈsteɪɪŋ fɔː faɪv deɪz. ˈdjʊərɪŋ ðɪs taɪm, ðeɪ wɪl gɪv faɪv pəˈfɔːmənsɪz. æz ˈjuːʒʊəl, ðə pəˈliːs wɪl hæv ə ˈdɪfɪkəlt taɪm. ðeɪ wɪl biːˈtraɪɪŋ tuː kiːp ˈɔːdə. ɪt ɪz ˈɔːlweɪz ðə seɪm ɒn ðiːz əˈkeɪʒənz.
任务配置：L0+L1
知识笔记：
生词和短语
all parts of the country 全国各地
by train 乘火车
as usual 和往常一样
keep order 维持秩序
练习/tr/的发音：
舌身采取发/r/的姿势，舌尖向上贴住上齿龈后部，形成阻碍。
舌头放开，气流从舌尖和齿龈间冲出，冲破阻碍发出短促的/t/后立即发/r/。
双唇稍稍突出，略成圆形。
/tr/是清辅音，送气强，声带不振动。
音标相关单词练习：
country /ˈkʌntri/
train /treɪn/
trying /ˈtraɪɪŋ/
