练习材料
Lesson 20-3 Snake poison
Vipers (adders) and rattlesnakes manufacture the blood poison, which is known as haemolytic. Both poisons are unpleasant, but by far the more unpleasant is the blood poison. It is said that the nerve poison is the more primitive of the two, that the blood poison is, so to speak, a newer product from an improved formula. Be that as it may, the nerve poison does its business with man far more quickly than the blood poison. This, however, means nothing. Snakes did not acquire their poison for use against man but for use against prey such as rats and mice, and the effects on these of viperine poison is almost immediate.
/ˈlɛsən/ 20-3 /sneɪk/ /ˈpɔɪzən/
/ˈvaɪpərz/ (/ˈædərz/) /ænd/ /ˈrætəlˌsneɪks/ /ˌmænjəˈfækʧər/ /ðə/ /blʌd/ /ˈpɔɪzən/, /wɪʧ/ /ɪz/ /noʊn/ /æz/ haemolytic. /boʊθ/ /ˈpɔɪzənz/ /ɑr/ /ənˈplɛzənt/, /bʌt/ /baɪ/ /fɑr/ /ðə/ /mɔr/ /ənˈplɛzənt/ /ɪz/ /ðə/ /blʌd/ /ˈpɔɪzən/. /ɪt/ /ɪz/ /sɛd/ /ðæt/ /ðə/ /nɜrv/ /ˈpɔɪzən/ /ɪz/ /ðə/ /mɔr/ /ˈprɪmətɪv/ /ʌv/ /ðə/ /tu/, /ðæt/ /ðə/ /blʌd/ /ˈpɔɪzən/ /ɪz/, /soʊ/ /tu/ /spik/, /ə/ /ˈnuər/ /ˈprɑdəkt/ /frɑm/ /ən/ /ɪmˈpruvd/ /ˈfɔrmjələ/. /bi/ /ðæt/ /æz/ /ɪt/ /meɪ/, /ðə/ /nɜrv/ /ˈpɔɪzən/ /dʌz/ /ɪts/ /ˈbɪznəs/ /wɪð/ /mən/ /fɑr/ /mɔr/ /ˈkwɪkli/ /ðæn/ /ðə/ /blʌd/ /ˈpɔɪzən/. /ðɪs/, /ˌhaʊˈɛvər/, /minz/ /ˈnʌθɪŋ/. /sneɪks/ /dɪd/ /nɑt/ /əˈkwaɪər/ /ðɛr/ /ˈpɔɪzən/ /fɔr/ /juz/ /əˈgɛnst/ /mən/ /bʌt/ /fɔr/ /juz/ /əˈgɛnst/ /preɪ/ /sʌʧ/ /æz/ /ræts/ /ænd/ /maɪs/, /ænd/ /ði/ /ɪˈfɛkts/ /ɑn/ /ðiz/ /ʌv/ viperine /ˈpɔɪzən/ /ɪz/ /ˈɔlˌmoʊst/ /ɪˈmidiət/.
