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erican scientist Jacobi Perkins in 1923 by mistake. E (Section B 1a— 1e) B A. The washing machine plays an important part in our daily lives. It can help to free our hands② so that we can spend our time on more meaningful things. B. The fridge is really useful. We can put many things in it to keep them fresh, such as the vegetables, meat and drinks. (Section B 1a— 1e) If we put lemons in it, they can keep sour for a long time. The customers like cool lemonade very much. C. Do you often feel hot in summer? Maybe an electric fan can help you. It is very us