https://online2.tingclass.net/lesson/shi0529/0008/8490/60.mp3
https://image.tingclass.net/statics/js/2012
30. Although most birds have only a negligible sense of smell, they have _____ vision.
A. vigorous B. exact C. acute D. vivid
vigorous 精力旺盛的, 有力的, 健壮的
exact 确切的, 精确的, 准确的
vivid 生动的, 形象的, 鲜明的
acute 敏锐的
vision 视力, 眼界
