练习材料：
L51-1: Predictingthe future
Predicting thefuture is notoriously difficult. Who could have imagined, in the mid 1970s, forexample, that by the end of the 20th century, computers would be as common inpeople's homes as TV sets? In the 1970s, computers were common enough, but onlyin big business, government departments, and large organizations. These werethe so- called mainframe machines. Mainframe computers were very large indeed,often occupying whole air-conditioned rooms, employing full-time techniciansand run on specially-written software. Though these large machines still exist,many of their functions have been taken over by small powerful personalcomputers, commonly known as PCs.In 1975, a primitive machine called theAltair, was launched in the USA.
prɪˈdɪktɪŋ ðə ˈfjuːʧə
prɪˈdɪktɪŋ ðə ˈfjuːʧər ɪz nəʊˈtɔːrɪəsli ˈdɪfɪkəlt. huː kʊd hæv ɪˈmæʤɪnd, ɪn ðə mɪd 1970ɛs, fɔːr ɪgˈzɑːmpl, ðæt baɪ ði ɛnd ɒv ðiː 20th ˈsɛnʧʊri, kəmˈpjuːtəz wʊd biː æz ˈkɒmən ɪn ˈpiːplz həʊmz æz ˌtiːˈviː sɛts? ɪn ðiː 1970ɛs, kəmˈpjuːtəz wɜː ˈkɒmən ɪˈnʌf, bʌt ˈəʊnli ɪn bɪg ˈbɪznɪs, ˈgʌvnmənt dɪˈpɑːtmənts, ænd lɑːʤ ˌɔːgənaɪˈzeɪʃənz. ðiːz wɜː ðə səʊ- kɔːld ˈmeɪnfreɪm məˈʃiːnz. ˈmeɪnfreɪm kəmˈpjuːtəz wɜː ˈvɛri lɑːʤ ɪnˈdiːd, ˈɒf(ə)n ˈɒkjʊpaɪɪŋ həʊl ˈeəkənˌdɪʃ(ə)nd ruːmz, ɪmˈplɔɪɪŋ fʊl-taɪm tɛkˈnɪʃənz ænd rʌn ɒn ˈspɛʃəli-ˈrɪtn ˈsɒftweə. ðəʊ ðiːz lɑːʤ məˈʃiːnz stɪl ɪgˈzɪst, ˈmɛni ɒv ðeə ˈfʌŋkʃənzhæv biːn ˈteɪkən ˈəʊvə baɪ smɔːl ˈpaʊəfʊl ˈpɜːsnl kəmˈpjuːtəz, ˈkɒmənli nəʊn æzpiː-siːz.ɪn 1975, ə ˈprɪmɪtɪv məˈʃiːn kɔːld ði ˈælteə, wɒz lɔːnʧt ɪn ðə juː-ɛs-eɪ.
任务配置：L0+L4
知识笔记：
单词：1、predicting：预测，2、notoriously：臭名昭著，3、mainframe：主机，4、air-conditioned：有空调，5、technicians：技术人员，6、primitive：原始，7、launch：发射，发动，发起，开展
音标：
练习感悟：今天的文章简短，易读，录了一遍就达标了
