高中应以必修二P19第二题答案

Topic sentence
P1:Over time I have been changed quite a lot.
P2:These changes only became possible as my memory improved.
P3:Since the 1970s many new applications have been found for me.
Supporting details
P1:calculating machine,analytical machine,universal machine,PC,laptop
P2:tubes,transistors,chips,network,World Wide Web
P3:communications,finance,trade,robots,mobile phones,medical operations,space rockets,providing life of high quality
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