Read the text below and answer question.
The surprising truths and myths about microchip implants
(Richard Gray for BBC Capital)
The tiny bump on the back of Dave Williams‘ hand is barely noticeable – most people would miss the rice-grain-sized lump between his thumb and forefinger at first. It is only when the 33-year-old opens his front door with a wave of his hand that it becomes clear something strange is going on. Embedded under Williams‘ skin is a microchip implant – an electronic circuit inside a pill-shaped glass capsule – that can be used much like a contactless credit card.
Williams, a systems engineer at software firm Mozilla, is one of a growing number of socalled ''biohackers'' who are choosing to augment their bodies with technology. In Williams‘ case, he chose to implant a radio frequency identification (RFID) chip into his hand out of curiosity.
The procedure has essentially turned him into a walking contactless smart card. By registering the tag with a variety of devices, he can use it to trigger certain functions, such as transferring his contact details to a friend‘s mobile phone.
Another level of convenience
''I have the world's worst memory,'' says Williams. The fact that he now has a gadget on him at all times that opens doors and unlocks his computer – one that he can‘t leave at home or forget – is a huge advantage. ''It's also fun to give someone my number and email address by touching their phone to my hand.''
This new level of convenience is one of the biggest draws for those installing implantable RFID implants, and the number of people experimenting with the devices is growing. One manufacturer of the chips, Dangerous Things, told CNBC last year that it had sold more than 10,000 of them, along with the kits needed to install them under the skin. But as they become more widespread, concerns are growing about what the trend might mean for personal privacy and security.
This week, a vending machine company based in River Falls, Wisconsin, announced that it is offering to implant chips into its employees‘ hands. Three Square Market says a $300 (£230) chip will allow workers to open doors, log in to computers and even purchase food in their canteen. Already 50 employees have signed up to have an implant. They‘re not the only ones to do so. Cincinnati-based video surveillance firm CityWatcher embedded the gadgets under the skin of two employees in 2006, and technology incubator EpiCentre said it would be offering the chips to its members in Stockholm earlier this year.
BioHax International, which is supplying the chips to Three Square Market, says dozens of other firms around the world – including some multinationals – are looking to implement similar schemes in their workplaces.
The trend has sparked alarm over whether wireless implants could be used to keep tabs on employees by tracking their movements, and civil liberties groups warn they could be used intrude upon privacy in other ways. Many of those already working with the implants, however, are baffled by this concern.
(Adapted from: http://www.bbc.com/capital/story/20170731- the-surprising-truths-and-myths-about-microchip-implants)
Analyze the items below.
I. The pill-shaped glass capsule size makes the microchip be noticeable.
II. Having a gadget embedded under a person‘s skin can be convenient.
III. Microchip implants are compulsory for workers in many companies nowadays.
IV. The growth of microchip implants does not indicate that there is no controversy over this issue.
According to the text, it‘s CORRECT only what is mentioned in
