练习材料：
L55-2: From theearth: Greetings
Alternatively, ifthe star were small, the life-supporting planet would have to have a closeorbit round it and also provide the perfect conditions for life forms todevelop. But how would we find such a planet? At present, there is no telescopein existence that is capable of detecting the presence of life. The developmentof such a telescope will be one of the great astronomical projects of thetwenty-first century.
It is impossibleto look for life on another planet using earth-based telescopes. Our own warmatmosphere and the heat generated by the telescope would make it impossible todetect objects as small as planets. Even a telescope in orbit round the earth,like the very successful Hubble telescope, would not be suitable because of thedust particles in our solar system.
frɒm ði ɜːθ: ˈɡriːtɪŋz
ɔːlˈtɜːnətɪvli, ɪf
ðə stɑː wɜː smɔːl, ðə laɪf-səˈpɔːtɪŋ ˈplænɪt wʊd
hæv tuː hæv ə kləʊs ˈɔːbɪt raʊnd ɪt ænd ˈɔːlsəʊ prəˈvaɪd ðə ˈpɜːfɪkt kənˈdɪʃᵊnz
fɔː laɪf fɔːmz tuː dɪˈvɛləp. bʌt haʊ wʊd wiː faɪnd sʌʧ ə ˈplænɪt? æt ˈprɛzᵊnt,
ðeər ɪz nəʊ ˈtɛlɪskəʊp ɪn ɪɡˈzɪstəns ðæt ɪz ˈkeɪpəbᵊl ɒv dɪˈtɛktɪŋ ðə ˈprɛzns ɒv laɪf. ðə dɪˈvɛləpmənt
ɒv sʌʧ ə ˈtɛlɪskəʊp wɪl biː wʌn ɒv ðə ɡreɪt ˌæstrəˈnɒmɪkəl ˈprɒʤɛkts ɒv ðə ˈtwɛnti-fɜːst ˈsɛnʧʊri.
ɪt ɪz ɪmˈpɒsəbᵊl
tuː lʊk fɔː laɪf ɒn əˈnʌðə ˈplænɪt ˈjuːzɪŋ ɜːθ-beɪst ˈtɛlɪskəʊps. ˈaʊər əʊn wɔːm
ˈætməsfɪər ænd ðə hiːt ˈʤɛnəreɪtɪd baɪ ðə ˈtɛlɪskəʊp wʊd meɪk ɪt ɪmˈpɒsəbᵊl tuː
dɪˈtɛkt ˈɒbʤɪkts æz smɔːl æz ˈplænɪts.ˈiːvən ə ˈtɛlɪskəʊp ɪn ˈɔːbɪt raʊnd ði ɜːθ,
laɪk ðə ˈvɛri səkˈsɛsfʊl Hubble ˈtɛlɪskəʊp, wʊd nɒt biː ˈsjuːtəbᵊl bɪˈkɒz ɒv ðə
dʌst ˈpɑːtɪklz ɪn ˈaʊə ˈsəʊlə ˈsɪstəm.
任务配置：L0 + L4
知识笔记：
单词：1、alternatively：要不，或者，2、astronomical：天文，3、suitable：合适的，适当，适宜，4、particle：粒子，微粒
音标：
练习感悟：奇怪了，明明感觉这篇文章语速很快，但是读起来我却老是比原录音快多了。
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