练习材料：
Lesson 43-2 Are there strangers in space?
Although perhapsonly 1 percent of the life that has started somewhere will develop into highlycomplex and intelligent patterns, so vast is the number of planets, thatintelligent life is bound to be a natural part of the universe.
If then we are socertain that other intelligent life exists in the universe, why have we had novisitors from outer space yet? First of all, they may have come to this planetof ours thousands or millions of years ago, and found our then prevailingprimitive state completely uninteresting to their own advanced knowledge.Professor Ronald Bracewell, a leading American radio astronomer, argued inNature that such a superior civilization, on a visit to our own solar system,may have left an automatic messenger behind to await the possible awakening ofan advanced civilization.
ɑː ðeə ˈstreɪnʤəz ɪn speɪs?
ɔːlˈðəʊ pəˈhæps ˈəʊnli
1 pɜː sɛnt ɒv ðə laɪf ðæt hæz ˈstɑːtɪd ˈsʌmweə wɪl dɪˈvɛləp ˈɪntuː ˈhaɪli ˈkɒmplɛks ænd ɪnˈtɛlɪʤᵊnt
ˈpætᵊnz, səʊ vɑːst ɪz ðə ˈnʌmbər ɒv ˈplænɪts, ðæt ɪnˈtɛlɪʤᵊnt
laɪf ɪz baʊnd tuː biː ə ˈnæʧᵊrᵊl pɑːt ɒv ðə ˈjuːnɪvɜːs.
ɪf ðɛn wiː ɑː səʊ ˈsɜːtᵊn ðæt ˈʌðər ɪnˈtɛlɪʤᵊnt laɪf ɪɡˈzɪsts ɪn ðə ˈjuːnɪvɜːs, waɪ hæv wiː hæd nəʊ
ˈvɪzɪtəz frɒm ˈaʊtə speɪs jɛt? fɜːst ɒv ɔːl, ðeɪ meɪ hæv kʌm tuː ðɪs ˈplænɪt ɒv
ˈaʊəz ˈθaʊzəndz ɔː ˈmɪljənz ɒv jɪəz əˈɡəʊ, ænd faʊnd ˈaʊə ðɛn prɪˈveɪlɪŋ ˈprɪmɪtɪv steɪt kəmˈpliːtli
ʌnˈɪntrɛstɪŋ tuː ðeər əʊn ədˈvɑːnst ˈnɒlɪʤ. prəˈfɛsə ˈrɒnəld Bracewell, ə ˈliːdɪŋ əˈmɛrɪkən ˈreɪdiəʊ əsˈtrɒnəmə,
ˈɑːɡjuːd ɪn ˈneɪʧə ðæt sʌʧ ə suːˈpɪəriə ˌsɪvᵊlaɪˈzeɪʃᵊn, ɒn
ə ˈvɪzɪt tuː ˈaʊər əʊn ˈsəʊlə ˈsɪstəm, meɪ hæv lɛft ən ˌɔːtəˈmætɪk ˈmɛsɪnʤə bɪˈhaɪnd
tuː əˈweɪt ðə ˈpɒsəbᵊl əˈweɪknɪŋ ɒv ən ədˈvɑːnst ˌsɪvᵊlaɪˈzeɪʃᵊn.
任务配置：L0 + L4
知识笔记：
单词：1、complex：复杂，复杂，2、prevailing：盛行的，广布的，3、radio：收音机，无线的，4、automatic：自动的，5、
音标：
练习感悟：这篇文章，虽然生词不多，但是读起来特别拗口，录了四五遍才达标。
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