练习材料：
Lesson 30-2 Exploring the sea-floor
A burst ofactivity associated with the laying of submarine cables soon confirmed thechallenger's observation that many parts of the ocean were two to three milesdeep, and the existence of underwater features of considerable magnitude.
Today, enoughsoundings are available to enable a relief map of the Atlantic to be drawn andwe know something of the great variety of the sea bed's topography. Since thesea covers the greater part of the earth's surface, it is quite reasonable toregard the sea floor as the basic form of the crust of the earth, with,superimposed upon it the continents, together with the islands and otherfeatures of the oceans. The continents form rugged tablelands which standnearly three miles above the floor of the open ocean.
ɪksˈplɔːrɪŋ ðə siː-flɔː
ə bɜːst ɒv ækˈtɪvəti
əˈsəʊsieɪtɪd wɪð ðə ˈleɪɪŋ ɒv ˌsʌbməˈriːn ˈkeɪbᵊlz suːn kənˈfɜːmd ðə ˈʧælɪnʤəz
ˌɒbzəˈveɪʃᵊn ðæt ˈmɛni pɑːts ɒv ði ˈəʊʃᵊn wɜː tuː tuː θriː maɪlz diːp, ænd ði ɪɡˈzɪstᵊns ɒv ˈʌndəˈwɔːtə ˈfiːʧəz ɒv kənˈsɪdərəbᵊl
ˈmæɡnɪtjuːd.
təˈdeɪ, ɪˈnʌf ˈsaʊndɪŋzɑːr əˈveɪləbᵊl tuː ɪˈneɪbᵊl ə rɪˈliːf mæp ɒv
ði ətˈlæntɪk tuː biː drɔːn ænd wiː nəʊ ˈsʌmθɪŋ ɒv ðə ɡreɪt vəˈraɪəti ɒv ðə siː bɛdz təˈpɒɡrəfi. sɪns ðə siː ˈkʌvəz ðə ˈɡreɪtə pɑːt ɒv ði ɜːθs ˈsɜːfɪs, ɪt ɪz kwaɪt ˈriːznəbᵊl tuː rɪˈɡɑːd ðə siː flɔːr æz ðə ˈbeɪsɪk fɔːm ɒv ðə krʌst
ɒv ði ɜːθ, wɪð, ˈsuːpərɪmˈpəʊzd əˈpɒn, ɪt ðə ˈkɒntɪnənts, təˈɡɛðə wɪð ði ˈaɪləndz ænd ˈʌðə ˈfiːʧəz ɒv ði
ˈəʊʃᵊnz. ðə ˈkɒntɪnənts fɔːm ˈrʌɡɪd ˈteɪbllændz wɪʧ stænd ˈnɪəli θriː maɪlz əˈbʌv ðə flɔːrɒv ði ˈəʊpᵊn ˈəʊʃᵊn.
任务配置：L0 + L4
知识笔记：
单词：1、burst：爆裂，破裂，决口，2、a burst of activity：一阵活动，3、laying：铺设，4、submarine：潜艇，5、magnitude：震级，大小，6、relief：宽慰，缓解，解脱，relief map：地形图，7、topography：地形，地势，8、crust：脆皮，甲壳，面包皮，9、superimposed：叠加的，10、rugged：崎岖，11、tablelands：高原，12、
音标：
练习感悟：这篇文章有几个词很难读，导致我不是读得慢就是读得有点快，录了三遍才达标。
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