參考答案：

【小題20】D
【小題21】A
【小題22】B

習題解析：

【小題20】聽力原文中明確提到 Cosmetic or plastic surgery often evokes images of famous personalities wanting to alter their appearances through elective surgical procedures.即整容手術常常會令人們聯想到那些想要通過非必要外科整形手術來改變自己外貌的名人，故選項 D 為答案et1Jc,X9;spLIh。另外，本題也可根據一般生活常識判斷，非必要的外科整形都是為了改善外貌，變得更好Zg~+N.oPnZX。
【小題21】聽力原文中提到 In addition to the care they provide, these volunteer specialists also provide training to health care workers in these procedures so that local hospitals, nurses, and doctors can become self-sufficient.由此可知，除了給發展中國家的病人提供醫療服務外，這些專家志愿者還為醫護工作者提供相關的培訓，從而使得當地的醫院、護士和醫生能夠自給自足，故選項 A 為答案OdK5s+5_74Pe2;EMGW。
【小題22】聽力原文中明確提到 the health care worker who performs the procedure perhaps feels a greater understanding and compassion for those who suffer from such defects，由此可知，實施手術的醫護工作者可能會更加理解與同情患有這些缺陷的人，故選項 B 為答案m_DfGCEb~j)F*46_v。