练习材料：
Lesson43 Over the South Pole
In 1929, three years after his flight over the North Pole, the American explorer, R. E. Byrd, successfully flew over the South Pole for the first time. Though, at first, Byrd and his men were able to take a great many photographs of the mountains that lay below, they soon ran into serious trouble. At one point, it seemed certain that their plane would crash. It could only get over the mountains if it rose to 10,000 feet. Byrd at once ordered his men to throw out two heavy food sacks. The plane was then able to rise and it cleared the mountains by 400 feet. Byrd now knew that he would be able to reach the South Pole which was 300 miles away, for there were no more mountains in sight. The aircraft was able to fly over the endless white plains without difficulty
ˈlɛsən43 ˈoʊvər ðə saʊθ poʊl
ɪn 1929, θri jɪrz ˈæftər hɪz flaɪt ˈoʊvər ðə nɔrθ poʊl, ði əˈmɛrəkən ɪkˈsplɔrər, ɑr. i. bɜrd, səkˈsɛsfəli flu ˈoʊvər ðə saʊθ poʊl fər ðəfɜrst taɪm. ðoʊ, ət fɜrst, bɜrd ənd ɪz mɛn wər ˈeɪbəl tə teɪk ə greɪt ˈmɛni ˈfoʊtəˌgræfs əv ðə ˈmaʊntənz ðət leɪ bɪˈloʊ, ðeɪ sun rænˈɪntə ˈsɪriəs ˈtrʌbəl. ət wʌn pɔɪnt, ɪt simd ˈsɜrtən ðət ðɛr pleɪn wəd kræʃ. ɪt kəd ˈoʊnli gɛt ˈoʊvər ðə ˈmaʊntənz ɪf ɪt roʊztʊ 10,000 fit. bɜrd ət wʌns ˈɔrdərd ɪz mɛn tə θroʊ aʊt tu ˈhɛvi fud sæks. ðə pleɪn wəz ðɛn ˈeɪbəl tə raɪz ənd ɪt klɪrd ðə ˈmaʊntənzbaɪ 400 fit. bɜrd naʊ nu ðət hi wəd bi ˈeɪbəl tə riʧ ðə saʊθ poʊl wɪʧ wʌz 300 maɪlz əˈweɪ, fər ðər wər noʊ mɔr ˈmaʊntənz ɪn saɪt. ðiˈɛrˌkræft wəz ˈeɪbəl tə flaɪ ˈoʊvər ði ˈɛndləs waɪt pleɪnz wɪˈθaʊt ˈdɪfəkəlti
任务配置：L0➕L4
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