题目

On May 24, Theresa May gave a public speech outside Downing Street. She made the decision to resign（辞职）as the UK's prime minister（首相）after failing to pass Brexit- a plan to separate（使脱离）the UK from the European Union (EU).May broke down in tears as she finished her speech. Many people have wondered what she’s like in her personal life.May, who was born in 1956, is the UK's second female（女性的）prime minister after Margaret Thatcher. She had to overcome many challenges to get to this position. When she was a child, she dreamed about becoming the first female p注射天花疫苗，可增强人体的A. 特异性免疫B. 非特异性免疫C. 先天性免疫D. 第二道防线