【资料卡片】：

①柠檬酸水溶液显酸性；

②工业生产柠檬酸，原料预处理后，得到的发酵液中含有柠檬酸及其他可溶性杂质；

③一水柠檬酸在不同温度下的溶解度下表：

④某种专用树脂对柠檬酸的吸附率和水温的关系如图1：

【钙盐法制备】（如图2）

如图的电路中，电流表测量的是(    )

阅读表达 (阅读短文，并根据短文内容回答问题。)

    Computers are useful machines．They can help people a lot in their daily life ． For example，they can help people to save much time to do much work，and they can help people to work out many problems easily．Our country asks everyone to learn to use computers before the twenty-first century，except the old people．

    Today more and more families own computers ． Parents buy computers for their children．They hope computers can help them improve their studies in school．Yet，many of their children use computers to play games，to watch videos or to chat．Computers can not help children to study but make them fall behind．So computers are locked in boxes by parents．

    In some other countries，even some scientists also hate computers．They say computers let millions of people lose their jobs or bring them a lot of trouble．Will computers really bring trouble to people or can they bring people happiness? It will be decided by today's students themselves!

125×(13×8)

Tom is very nice, but he does like to d____ (控制) the conversation.