2. 外语
  3. At Kew Gardens, the giant Victoria lily grows in a small pond.Suppose it doubles its size each day and it covers the whole pond—

At Kew Gardens, the giant Victoria lily grows in a small pond.Suppose it doubles its size each day and it covers the whole pond—

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问题 At Kew Gardens, the giant Victoria lily grows in a small pond.Suppose it doubles its size each day and it covers the whole pond—as it does—after 30 days.After how many days does it cover half the pond?
选项
答案After 29 days.
解析 题干意思是指睡莲每天增一倍，30天后覆盖整个湖面，问题是“多少天后覆盖半个湖面”，由于一天增一倍，所以是前一天，即29天后，覆盖的是半个湖面。
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本试题收录于： A类竞赛（研究生）题库大学生英语竞赛（NECCS）分类
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