练习材料：
Lesson 7 Too late 为时太晚
The plane was late and detectives were waiting at the airport all morning. They were expecting a valuable parcel of diamond 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!
[ðə] [pleɪn] [wɒz] [leɪt] [ænd] [dɪˈtɛktɪvz][wɜː] [ˈweɪtɪŋ][æt] [ði] [ˈeəpɔːt] [ɔːl][ˈmɔːnɪŋ]. [ðeɪ] [wɜːr] [ɪksˈpɛktɪŋ] [ə][ˈvæljʊəbl] [ˈpɑːsl][ɒv] [ˈdaɪəmənd][frɒm] [saʊθ][ˈæfrɪkə]. [ə] [fjuː] [ˈaʊəz] [ˈɜːlɪə], [ˈsʌmwʌn] [hæd][təʊld] [ðə] [pəˈliːs] [ðæt] [θiːvz] [wʊd][traɪ] [tuː][stiːl] [ðə] [ˈdaɪəməndz]. [wɛn] [ðə] [pleɪn] [əˈraɪvd], [sʌm] [ɒv] [ðə] [dɪˈtɛktɪvz][wɜː] [ˈweɪtɪŋ][ɪnˈsaɪd] [ðə] [meɪn] [ˈbɪldɪŋ][waɪl] [ˈʌðəz] [wɜː] [ˈweɪtɪŋ][ɒn] [ði] [ˈeəfiːld]. [tuː] [mɛn] [tʊk] [ðə] [ˈpɑːsl] [ɒf] [ðə] [pleɪn] [ænd] [ˈkærid] [ɪt] [ˈɪntuː] [ðə] [ˈkʌstəmz][haʊs]. [waɪl] [tuː] [dɪˈtɛktɪvz] [wɜː][ˈkiːpɪŋ] [gɑːd][æt] [ðə] [dɔː], [tuː] [ˈʌðəz] [ˈəʊpənd] [ðə] [ˈpɑːsl]. [tuː] [ðeə] [səˈpraɪz], [ðə] [ˈprɛʃəs] [ˈpɑːsl][wɒz] [fʊl][ɒv] [stəʊnz][ænd] [sænd]!
任务配置：
L0+L4
知识笔记：
今日练习： [θ]，[ð]
百度查得：
/θ/在下面单词中的发音
south/saʊθ/n. 南方
path/pɑːθ/n. 道路
mouth/maʊθ/n. 口
math/mæθ/n. 数学
think/θɪŋk/vt. 想
path/pɑːθ/n. 道路
发音方法
1）舌尖微微伸出，置于上下门齿之间，舌身成扁平。
2）气流由舌齿间泻出，摩擦成音，舌尖和下齿之间的气流通道非常窄小，气流从舌齿间的窄缝中泄出。
注意：/θ/是个清辅音，声带不震动。要注意与/ð/,/s/,/z/的区别，发这个音主要是舌尖与上齿之间的摩擦，所以千万不要紧紧咬住舌尖，应该是上齿轻触舌尖。
下面列出发/θ/音的字母或字母组合的单词
a、在英语中发[θ]这个音一般只有th字母组合,例词：
thing/θɪŋ/n. 事情
death/deθ/n. 死
tooth/tuːθ/n. 牙齿
booth/buːθ/n. 货摊
cloth/klɒθ/n. 布
thin/θɪn/adj. 薄的
bathroom/'bɑːθruːm/n. 浴室
birthday/'bɜːθdeɪ/n. 生日
health/helθ/n. 健康
theater/'θɪətə/n. 电影院
练习感悟：
今天这一课中， [θ]，[ð]的音非常多且密集，真的是被虐到了，录音练习了N遍，但是越说越差，有些急躁。最后这个音没纠正好，别的单词都快不会说了。看来这个音要一段时间持续的练习，让舌头习惯它。明天继续练这个音。
