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 pəˈsɛnt 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 ˈnæʧrəl pɑːt ɒv ðə ˈjuːnɪvɜːs.
ɪf ðɛn wiː ɑː səʊ ˈsɜːtn ðæt ˈʌðər ɪnˈtɛlɪʤənt laɪf ɪgˈzɪsts
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 əˈgəʊ,
ænd faʊnd ˈaʊə ðɛn prɪˈveɪlɪŋ ˈprɪmɪtɪv steɪt kəmˈpliːtli ʌnˈɪntrəstɪŋ tuː ðeər
əʊn ədˈvɑːnst ˈnɒlɪʤ. prəˈfɛsə ˈrɒnəld Bracewell, ə
ˈliːdɪŋ əˈmɛrɪkən ˈreɪdɪəʊ əsˈtrɒnəmə, ˈɑːgjuːd ɪn ˈneɪʧə ðæt sʌʧ ə sju(ː)ˈpɪərɪə ˌsɪvɪlaɪˈzeɪʃən,
ɒn ə ˈvɪzɪt tuː ˈaʊər əʊn ˈsəʊlə ˈsɪstɪm, meɪ hæv lɛft ən ˌɔːtəˈmætɪk ˈmɛsɪnʤə
bɪˈhaɪnd tuː əˈweɪt ðə ˈpɒsəbl əˈweɪknɪŋ ɒv ən ədˈvɑːnst ˌsɪvɪlaɪˈzeɪʃən.
任务配置：L0 + L4
知识笔记：
单词：1、complex：复杂的，复杂化，2、prevailing：盛行的，广布的，3、automatic：自动的，4、
音标：
练习感悟：今天的文章不难理解，生词不多，读起来也不算拗口，但是语速太快了，快到每次跟读都经常跟读不上，录了四五遍，才勉强达标。
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