30. 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, 健壯的
</vigorous>
<exact>
exact 確切的, 精確的, 準確的
</exact>
<vivid>
vivid 生動的, 形象的, 鮮明的
</vivid>
<acute>
acute 敏銳的
</acute>
<vision>
vision 視力, 眼界
</vision>
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