练习材料：
Lesson 2-2 Spare that spider
How many spiders
are engaged in this work on our behalf? One authority on spiders made a census
of the spiders in a 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 byspiders in Britain in one year would be greater than the total weight of allthe human beings in the country.
speə ðæt ˈspaɪdə
haʊ ˈmɛni ˈspaɪdəzɑːr ɪnˈɡeɪʤd ɪn ðɪs wɜːk ɒn ˈaʊə bɪˈhɑːf? wʌn ɔːˈθɒrəti ɒn ˈspaɪdəz meɪd ə ˈsɛnsəs
ɒv ðə ˈspaɪdəz ɪn ə ɡrɑːs fiːld ɪn ðə saʊθ ɒv ˈɪŋɡlənd, 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 ɪmˈpɒsəbᵊl tuː meɪk mɔː ðæn ðə ˈwaɪldɪst ɡɛs æt haʊ ˈmɛni ðeɪ kɪl, bʌt ðeɪ ɑː ˈhʌŋɡri 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 ˈɡreɪtə ðæn ðə ˈtəʊtl weɪt ɒv ɔːl ðə ˈhjuːmənˈbiːɪŋz ɪn ðə ˈkʌntri.
任务配置：L0 + L4
知识笔记：
单词：1、engage：从事，聘用，2、on our behalf：代表我方，3、census：统计，人口普查，4、acre：英亩，5、pitch：抛，投球，球场，场地
音标：
练习感悟：虽然简短，单词也不多，但读起来却相当地拗口，不知道为什么。
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