练习材料：
NCE--第三册
L55-1: From the earth: Greetings
Recent developments in astronomy have made it possible to detect planets in our own Milky Way and in other galaxies. This is a major achievement because, in relative terms, planets are very small and do not emit light. Finding planets is proving hard enough, but finding life on them will prove infinitely more difficult. The first question to answer is whether a planet can actually support life. In our own solar system, for example, Venus is far too hot and Mars is far too cold to support life. Only the Earth provides ideal conditions, and even here it has taken more than 4 billion years for plant and animal life to evolve. Whether a planet can support life depends on the size and brightness of its star, that is its 'sun'. Imagine a star up to 20 times larger, brighter and hotter than our own sun. A planet would have to be a very long way from it to be capable of supporting life.
[ˈriːsnt] [dɪˈvɛləpmənts] [ɪn] [əsˈtrɒnəmi] [hæv] [meɪd] [ɪt] [ˈpɒsəbl] [tuː] [dɪˈtɛkt] [ˈplænɪts] [ɪn] [ˈaʊər] [əʊn] [ˈmɪlki] [weɪ] [ænd] [ɪn] [ˈʌðə] [ˈgæləksiz]. [ðɪs] [ɪz] [ə] [ˈmeɪʤər] [əˈʧiːvmənt] [bɪˈkɒz], [ɪn] [ˈrɛlətɪv] [tɜːmz], [ˈplænɪts] [ɑː] [ˈvɛri] [smɔːl] [ænd] [duː] [nɒt] [ɪˈmɪt] [laɪt]. [ˈfaɪndɪŋ] [ˈplænɪts] [ɪz] [ˈpruːvɪŋ] [hɑːd] [ɪˈnʌf], [bʌt] [ˈfaɪndɪŋ] [laɪf] [ɒn] [ðɛm] [wɪl] [pruːv] [ˈɪnfɪnɪtli] [mɔː] [ˈdɪfɪkəlt]. [ðə] [fɜːst] [ˈkwɛsʧən] [tuː] [ˈɑːnsər] [ɪz] [ˈwɛðər] [ə] [ˈplænɪt] [kæn] [ˈækʧʊəli] [səˈpɔːt] [laɪf]. [ɪn] [ˈaʊər] [əʊn] [ˈsəʊlə] [ˈsɪstɪm], [fɔːr] [ɪgˈzɑːmpl], [ˈviːnəs] [ɪz] [fɑː] [tuː] [hɒt] [ænd] [mɑːz] [ɪz] [fɑː] [tuː] [kəʊld] [tuː] [səˈpɔːt] [laɪf]. [ˈəʊnli] [ði] [ɜːθ] [prəˈvaɪdz] [aɪˈdɪəl] [kənˈdɪʃənz], [ænd] [ˈiːvən] [hɪər] [ɪt] [hæz] [ˈteɪkən] [mɔː] [ðæn] 4 [ˈbɪljən] [jɪəz] [fɔː] [plɑːnt] [ænd] [ˈænɪməl] [laɪf] [tuː] [ɪˈvɒlv]. [ˈwɛðər] [ə] [ˈplænɪt] [kæn] [səˈpɔːt] [laɪf] [dɪˈpɛndz] [ɒn] [ðə] [saɪz] [ænd] [ˈbraɪtnɪs] [ɒv] [ɪts] [stɑː], [ðæt] [ɪz] [ɪts] [sʌn]. [ɪˈmæʤɪn] [ə] [stɑːr] [ʌp] [tuː] 20 [taɪmz] [ˈlɑːʤə], [ˈbraɪtər] [ænd] [ˈhɒtə] [ðæn] [ˈaʊər] [əʊn] [sʌn]. [ə] [ˈplænɪt] [wʊd] [hæv] [tuː] [biː] [ə] [ˈvɛri] [lɒŋ] [weɪ] [frɒm] [ɪt] [tuː] [biː] [ˈkeɪpəbl] [ɒv] [səˈpɔːtɪŋ] [laɪf].
任务配置：
L0+L4
知识笔记 ：
练习感悟：
今天是课文第一部分，比较简单。难点是元音的发音，有几个以前遇到的词，以为会发音的，后来其中一些元音记错了，又重新查了，不能相信模糊的记忆，稍有不确定还是要查的。
