本大纲适用于修完《基本要求》B级所规定的全部内容的高等职业教育、普通高等专科教育、成人高等教育和本科独立学院各非英语专业的学生。[16] Nighthawks are most frequently observed hunting in the course of crepuscular periods, or through twilight, which necessitates superior eyesight with insect