题目

The fashionable technology of virtual reality (虚拟现实) (VR) --- the wonderful world created by computers --- is finally here, but before you rush out to buy the headset, you’ll want to take notice of experts’ warnings.“These devices are designed mostly for adult use,” said Dr. Justin Asgarpour, Vancouver optometrist (whose job is to examine people’s eyes and to sell glasses).Little research has been done about the long-term effects of VR on children, but makers have not designed the VR headsets for young eyes.VR headset maker Oculus Rift states that younger users may suffer fro用塑料梳子在干燥的头发上梳几下，梳子上会带电，经检验梳子带的是负电荷．下列说法中正确的是（ ）A．梳子得到了一些电子B．梳子失去了一些电子C．梳子失去了一些原子核D．摩擦创造了电荷