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阅读理解 On Friday, Germany's telecom regulator(电信业管理者), the Federal Network Agency, announced that a number of children s smartwatches, designed for ages 5 to 12, can allow someone to remotely tap into the watch s microphone and secretly spy from remote places. The regulator isn't just worried about the potential of people spying on children-it's worried the devices(设备) can be used to spy on anyone. And in Germany, it's illegal to record private conversations without permission. According to our investigations, parents were using the watches, for example, to listen in on t 在无色强酸性溶液中，下列各组离子能够大量共存的是 A．Cl -、Na+、NO3-、Ca2+   B．NH4+、HCO3-、Cl-、K+ C．K+、Ba2+、Cl-、SO42-    D．Cu2+、NH4+、I-、Cl-