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(单词翻译:双击或拖选)
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>