1 D (microscopic robot… device)
2 A (understand its surrounding environment, make decisions and move automatically)
3 В (a possible walking distance of around 100 nanometres)
4 A (One day, people could live … with miniature robot surgeons… protecting the insides of their bodies.)
5 C (most of these concerns are over safety regulations … would like further tests to be carried out on products before they are allowed to enter the market)