练习材料：
The plane was late and detectives were waiting at the airport all morning. They were expecting a valuable parcel of diamonds from South Africa. A few hours earlier, someone had told the police that thieves would try to steal the diamonds. When the plane arrived, some of the detectives were waiting inside the main building while others were waiting on the airfield. Two men took the parcel off the plane and carried it into the Customs House. While two detectives were keeping guard at the door, two others opened the parcel. To their surprise, the precious parcel was full of stones and sand!
全文音标：
ðə pleɪn wʌz leɪt ænd dɪˈtɛktɪvz wɜr ˈweɪtɪŋ æt ði ˈɛrˌpɔrt ɔl ˈmɔrnɪŋ. ðeɪ wɜr ɪkˈspɛktɪŋ ə ˈvæljəbəl ˈpɑrsəl ʌv ˈdaɪməndz frʌmsaʊθ ˈæfrəkə. ə fju ˈaʊərz ˈɜrliər, ˈsʌmˌwʌn hæd toʊld ðə pəˈlis ðæt θivz wʊd traɪ tu stil ðə ˈdaɪməndz. wɛn ðə pleɪnəˈraɪvd, sʌm ʌv ðə dɪˈtɛktɪvz wɜr ˈweɪtɪŋ ɪnˈsaɪd ðə meɪn ˈbɪldɪŋ waɪl ˈʌðərz wɜr ˈweɪtɪŋ ɑn ði ˈɛrˌfild. tu mɛn tʊk ðə ˈpɑrsəl ɔfðə pleɪn ænd ˈkærid ɪt ˈɪntu ðə ˈkʌstəmz haʊs. waɪl tu dɪˈtɛktɪvz wɜr ˈkipɪŋ gɑrd æt ðə dɔr, tu ˈʌðərz ˈoʊpənd ðə ˈpɑrsəl. tu ðɛrsərˈpraɪz, ðə ˈprɛʃəs ˈpɑrsəl wʌz fʊl ʌv stoʊnz ænd sænd!
任务配置：L0+L4
知识笔记：
1. 查的单词：
parcel/pɑrsəl/包裹
2. 音标
thief/thieves 里的ie为短元音/i/；steal里的/ea/也为短元音/i/
3.知识点
Customs House 海关
keep guard 站岗
练习感悟：
从这篇开始，长句增多了，不过大多都是由while连接起来的，朗读的时候注意断句。
