单项选择题
Passage Two Questions 30 to 32 are based on the passage you have just heard.
A. To make them live longer. B. To make profits from them. C. To prove the technology useful to them. D. To learn about their physical condition.
A. are unable to communicate their feelings accurately B. have trouble communicating their responses to events C. often feel abdominal pain without a known reason D. have a poor and overcrowded family