参考答案

正确答案：D
解析：结构识别be about to occur将要发生；A．adjacent邻近的：adjacent cities相邻的城市。B．gigantic巨大的：The new airplane looked like a gigantic bird．这架新飞机看起来像一只巨大的鸟。C．perilous危险的：a perilous journey across the mountains横越重山的艰险征途。D．imminent即将来临的，逼近的：He Was faced with imminent death．他面临逼近的死亡。