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  3. The home computers industry has been growing【21】in the world for the last twenty years. Computers used to be large, expensive ma

The home computers industry has been growing【21】in the world for the last twenty years. Computers used to be large, expensive ma

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问题     The home computers industry has been growing【21】in the world for the last twenty years. Computers used to be large, expensive machines that【22】very difficult to use. But scientists and technicians have been making smaller and cheaper while at the same time they have been made easier to use. As【23】, their popularity has been increasing as more people have been buying computers for their homes and businesses.
    Computers have been designed to store【24】and compute complex problems. Computers are used in【25】traffic in some cities. Stores use computers to keep records of their goods and to send【26】to their customers. Offices use computers to type letters, record business and communicate【27】other offices. People have been using computers in their homes to keep track of expenses and【28】their household appliances on and off.
    One important new【29】for computers is for entertainment. Many new games which have been designed to be played on the computers have become very popular【30】.
选项 A、get
B、make
C、turn
D、put
答案C
解析 本句的意思是：人们在家已使用计算机掌握家庭花费情况并打开和关闭家用电器。“turn something on and off”是一固定搭配，意思为“打开和关闭某物”；如：Shall I turn the television on(off)?我把电视机打开(关掉)好吗?
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