练习材料：
Lesson 2-2 Spare that spider
不要伤害蜘蛛
How many spiders are engaged in this work now our behalf? One authority on spiders made a census of the spiders in grass field in the south of England, and he estimated that there were more than 2,250,000 in one acre; that is something like 6,000,000 spiders of different kinds on a football pitch. Spiders are busy for at least half the year in killing insects. It is impossible to make more than the wildest guess at how many they kill, but they are hungry creatures, not content with only three meals a day. It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.
haʊ ˈmɛni ˈspaɪdəz ɑːr ɪnˈgeɪʤd ɪn ðɪs wɜːk nəʊ ˈaʊə bɪˈhɑːf? wʌn ɔːˈθɒrɪti ɒn ˈspaɪdəz meɪd ə ˈsɛnsəs ɒv ðə ˈspaɪdəz ɪn grɑːs fiːld ɪn ðə saʊθ ɒv ˈɪŋglənd, ænd hiː ˈɛstɪmeɪtɪd ðæt ðeə wɜː mɔː ðæn 2,250,000 ɪn wʌn ˈeɪkə; ðæt ɪz ˈsʌmθɪŋ laɪk 6,000,000 ˈspaɪdəz ɒv ˈdɪfrənt kaɪndz ɒn ə ˈfʊtbɔːl pɪʧ. ˈspaɪdəz ɑː ˈbɪzi fɔːr æt liːst hɑːf ðə jɪər ɪn ˈkɪlɪŋ ˈɪnsɛkts. ɪt ɪz ɪmˈpɒsəbl tuː meɪk mɔː ðæn ðə ˈwaɪldɪst gɛs æt haʊ ˈmɛni ðeɪ kɪl, bʌt ðeɪ ɑː ˈhʌŋgri ˈkriːʧəz, nɒt ˈkɒntɛnt wɪð ˈəʊnli θriː miːlz ə deɪ. ɪt hæz biːn ˈɛstɪmeɪtɪd ðæt ðə weɪt ɒv ɔːl ði ˈɪnsɛkts dɪsˈtrɔɪd baɪ ˈspaɪdəz ɪn ˈbrɪtn ɪn wʌn jɪə wʊd biː ˈgreɪtə ðæn ðə ˈtəʊtl weɪt ɒv ɔːl ðə ˈhjuːmən ˈbiːɪŋz ɪn ðə ˈkʌntri.
有多少蜘蛛在为我们效力呢？一位研究蜘蛛的权威对英国南部一块草坪上的蜘蛛作了一次调查。他估计每英亩草坪里有225万多只蜘蛛。这就是说，在一个足球场上约有600万只不同种类的蜘蛛。蜘蛛至少有半年在忙于吃昆虫。它们一年中消灭了多少昆虫，我们简直无法猜测，它们是吃不饱的动物，不满意一日三餐。据估计，在英国蜘蛛一年里所消灭昆虫的重量超过这个国家人口的总重量。
任务配置：L0、L3、L4
知识笔记：
单词与短语
be engaged in 为...效力
sth of different kinds不同种类的某物
at least half the year in doing sth至少有半年在忙于做某事
练习感悟：换模式了，目前感觉还好。
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