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阅读理解Youdon't need to get in a time-traveling machine to see how technology willreshape our lives, such as the way we shop. Several new technologies that areto change your buying habits already exist. Let's see what's in store for yourfuture shopping. Try it on, virtually. Want to shop online for a new pair of eyeglasses? You don't need to guess which pair looks best on you — use the eBay Fashion iPhone app to try a pair of eyewear you're checking out on a picture of your face. But what if you want to buy something bigger? Thanks to Microsoft Kinect's motion tracking camera, you can c显微镜的一个目镜分别与4个不同倍数的物镜组合来观察血涂片。当成像清晰时，每一物镜与载玻片的距离如图所示。如果载玻片位置不变，用哪一物镜在一个视野中看到的细胞最大（   ）