题目内容：
听音频，回答下列问题：Which of the following statements is TRUEabout the research Dr. Smith and his colleagues have been doing? A．Theytry to help cancer patients overcome flight.
B．Theyhelp doctors become sensitive to patients' feelings.
C．Theyhave been doing the research for five years.
D．Thereare totally four of them in the research program.
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答案解析：