练习材料：

NCE--第四册

Lesson 43-3 Are there strangers in space?

Such a messenger, receiving our radio and television signals, might well re-transmit them back to its home-planet, although what impression any other civilization would thus get from us is best left unsaid.

But here we come up against the most difficult of all obstacles to contact with people on other planets -- the astronomical distances which separate us. As a reasonable guess, they might, on an average, be 100 light years away. (A light year is the distance which light travels at 186,000 miles per second in one year, namely 6 million million miles.) Radio waves also travel at the speed of light, and assuming such an automatic messenger picked up our first broadcasts of the 1920's, the message to its home planet is barely halfway there. Similarly, our own present primitive chemical rockets, though good enough to orbit men, have no chance of transporting us to the nearest other star, four light years away, let alone distances of tens or hundreds of light years.

[sʌʧ] [ə] [ˈmɛsɪnʤə], [rɪˈsiːvɪŋ] [ˈaʊə] [ˈreɪdɪəʊ] [ænd] [ˈtɛlɪˌvɪʒən] [ˈsɪgnlz], [maɪt] [wɛl] [riː]-[trænzˈmɪt] [ðɛm] [bæk] [tuː] [ɪts] [həʊm]-[ˈplænɪt], [ɔːlˈðəʊ] [wɒt] [ɪmˈprɛʃən] [ˈɛni] [ˈʌðə] [ˌsɪvɪlaɪˈzeɪʃən] [wʊd] [ðʌs] [gɛt] [frɒm] [ʌs] [ɪz] [bɛst] [lɛft] [ʌnˈsɛd].

[bʌt] [hɪə] [wiː] [kʌm] [ʌp] [əˈgɛnst] [ðə] [məʊst] [ˈdɪfɪkəlt] [ɒv] [ɔːl] [ˈɒbstəklz] [tuː] [ˈkɒntækt] [wɪð] [ˈpiːpl] [ɒn] [ˈʌðə] [ˈplænɪts] -- [ði] [ˌæstrəˈnɒmɪkəl] [ˈdɪstənsɪz] [wɪʧ] [ˈsɛprɪt] [ʌs]. [æz] [ə] [ˈriːznəbl] [gɛs], [ðeɪ] [maɪt], [ɒn] [ən] [ˈævərɪʤ], [biː] 100 [laɪt] [jɪəz] [əˈweɪ]. ([ə] [laɪt] [jɪər] [ɪz] [ðə] [ˈdɪstəns] [wɪʧ] [laɪt] [ˈtrævlz] [æt] 186,000 [maɪlz] [pɜː] [ˈsɛkənd] [ɪn] [wʌn] [jɪə], [ˈneɪmli] 6 [ˈmɪljən] [ˈmɪljən] [maɪlz].) [ˈreɪdɪəʊ] [weɪvz] [ˈɔːlsəʊ] [ˈtrævl] [æt] [ðə] [spiːd] [ɒv] [laɪt], [ænd] [əˈsjuːmɪŋ] [sʌʧ] [ən] [ˌɔːtəˈmætɪk] [ˈmɛsɪnʤə] [pɪkt] [ʌp] [ˈaʊə] [fɜːst] [ˈbrɔːdkɑːsts] [ɒv] [ðiː] 1920[s], [ðə] [ˈmɛsɪʤ] [tuː] [ɪts] [həʊm] [ˈplænɪt] [ɪz] [ˈbeəli] [ˌhɑːfˈweɪ] [ðeə]. [ˈsɪmɪləli], [ˈaʊər] [əʊn] [ˈprɛznt] [ˈprɪmɪtɪv] [ˈkɛmɪkəl] [ˈrɒkɪts], [ðəʊ] [gʊd] [ɪˈnʌf] [tuː] [ˈɔːbɪt] [mɛn], [hæv] [nəʊ] [ʧɑːns] [ɒv] [trænsˈpɔːtɪŋ] [ʌs] [tuː] [ðə] [ˈnɪərɪst] [ˈʌðə] [stɑː], [fɔː] [laɪt] [jɪəz] [əˈweɪ], [lɛt] [əˈləʊn] [ˈdɪstənsɪz] [ɒv] [tɛnz] [ɔː] [ˈhʌndrədz] [ɒv] [laɪt] [jɪəz].

任务配置：

L0+L4

知识笔记 ：

练习感悟：

9.19

今天是课文第三部分。单词方面要注意元音发音和重音位置。注意，barely在文中作副词，表示“刚刚，才”。词组let alone表示“更不必说”。本课词组很多，注意掌握。

简书到9.28才能恢复更新，这是后来补的。