Read the following article and answer the question. Article: With the development of science and technology, our dailylife is becoming more colorful and more convenient. An Underwater Hotel It looks like a spaceship but it is actually a picture of an underwater hotel. A company plans to build the hotel in the sea which is about 15metres below the surface .The whole building is underwater and you can get to it by swimming and diving. Google Glass Google Glass is a pair of glasses with a battery hidden inside the frame . It can perform many of the same tasks as smart phones. The glass has hidden camera and a tiny screen. It is designed to take hands-free photos or videos of anything people are doing. A New Kind of shirt Hate washing clothes? You're going to love this kind of shirt made by an American clothing company, Wool Prince. This shirt can be worn for 100 straight days without washing! The Wool Prince shirt never needs ironing . The Digital Library Can you imagine walking into a library and finding all books have turned into companies? The first bookless public library is planned to open in San Antonio, Texas, America. Computers will take the place of books soon. Question: You needn't use _ when you take photos or video with Google Glass. Answer:
Answer:
your hand