问题：[单选题]
A . are being used to offer wireless access
B . are usually used to offer high-speed, mobile internet access
C . are already cheap enough to be used as passports
D . ale expected to be used as a means to control inventory
● 参考解析
【答案】D
【解析】本题答案在原文第一段。“Soon they will be small．powerful enough tO be implanted into everything from humans to milk cartons，…0r serve as form ofinventory control．”由此可见，D“无线电频率识别装置将可用来控制存货”为正确选项。
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