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!
任务分布：L0＋L4
知识点 th发音：
一、当位于词首时，可以从词性上判别其应有的读音。
第一类：四种词类th读清音，即国际音标的/θ/：
1、Noun名词：thing，theme主题等
2、Verb动词：think，thank等
3、Numeral数词：hree，thirteen等
4、Adjective形容词：thin，thorough彻底的等。
第二类：在以下两种词类读浊音/ð/：
1、Pronoun代词：they，them等
2、Functional terms功能词：the，than等
二、当位于词尾（或音节之尾）时：
1、多数是清音/θ/。如，bath，breath，both等
2、少数读作浊音/ð/。如，with，smooth等
三、当位于两个元音之间时：
1、多数是浊音/ð/。如，other，mother等
2、也有读清音/θ/。如，nothing，healthy等
注意：发/θ/,它的音和/s/相近,但是舌头需伸前,夹于上下齿之间；
发/ð/,它的音和/z/相近,但是舌头需伸前,夹于上下齿之间。
感悟：继续努力。