In this section, you will hear five short news items. After each item,which will be read only once, there will be a twenty-second pause. During the pause, read the question and the four choices marked A, B, C and D, and decide which is the best answer. Then mark the corresponding letter on the answer sheet with a single line through the centre. What is scientists’ latest research on robots
A．Robots that can run quickly on four legs. B．Robots that can carry heavy loads as pack animals do. C．Robots that are less expensive to build. D．Robots that can operate on batteries.