练习材料：
Lesson 7 Too late
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!
ˈlɛsən 7 tu leɪt
ðə pleɪn wʌz leɪt ænd dɪˈtɛktɪvz wɜr ˈweɪtɪŋ æt ði ˈɛrˌpɔrt ɔl ˈmɔrnɪŋ. ðeɪ wɜr ɪkˈspɛktɪŋ ə ˈvæljəbəl ˈpɑrsəl ʌv ˈdaɪməndz frʌm saʊθ ˈæfrəkə. ə fju ˈaʊərz ˈɜrliər, ˈsʌmˌwʌn hæd toʊld ðə pəˈlis ðæt θivz wʊd traɪ tu stil ðə ˈdaɪməndz. wɛn ðə pleɪn əˈraɪvd, sʌm ʌv ðə dɪˈtɛktɪvz wɜr ˈweɪtɪŋ ɪnˈsaɪd ðə meɪn ˈbɪldɪŋ waɪl ˈʌðərz wɜr ˈweɪtɪŋ ɑn ði ˈɛrˌfild. tu mɛn tʊk ðə ˈpɑrsəl ɔf ðə pleɪn ænd ˈkærid ɪt ˈɪntu ðə ˈkʌstəmz haʊs. waɪl tu dɪˈtɛktɪvz wɜr ˈkipɪŋ gɑrd æt ðə dɔr, tu ˈʌðərz ˈoʊpənd ðə ˈpɑrsəl. tu ðɛr sərˈpraɪz, ðə ˈprɛʃəs ˈpɑrsəl wʌz fʊl ʌv stoʊnz ænd sænd!
任务配置：L0+L4
知识笔记：
detective
美 /dɪˈtektɪv/
a person, especially a police officer, whose job is to examine crimes and catch criminals 侦探；警探
airfield
美 /ˈerfiːld/
an area of flat ground where military or private planes can take off and land 飞机场
customs house
a government office, esp at a port, where customs are collected and ships cleared for entry 海关
keep guard
站岗
precious
美 /ˈpreʃəs/
rare and worth a lot of money 珍奇的；珍稀的
be full of
练习感悟：又是晚练习的一天。。文章难度慢慢在提升，单词跟语法知识更加丰富了。
发音方面，/ð/在本篇出现的相当多，发音要点：
双唇微开，舌头伸出， 上下齿轻轻咬住舌头，气息尽量被上下齿堵住，留少量气息从牙齿缝隙吹出，振动声带。
原声时长：57s
录音时长：59s
练习时间：15min
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