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Although most birds have only a negligible sense of smell, they have _____ vision. A. vigorous B. exact C. acute D. vivid [vigorous] vigorous 精力旺盛的, 有力的, 健壮的 [/vigorous] [exact] exact 确切的, 精确的, 准确的 [/exact] [vivid] vivid 生动的, 形象的, 鲜明的 [/vivid] [acute] acute 敏锐的 [/acute] [vision] vision 视力, 眼界 [/vision] | 
