2. 外语
  3. Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many ye

Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many ye

admin2013-09-03  30
问题    Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many years. Now they’re beginning to fill in the blanks.
   Not long ago, experiments showed that birds rely on the sun to guide th
选项 A、have been known to scientists for years
B、have only recently been discovered
C、are known by everyone
D、will probably remain a mystery
答案B
解析 本篇第一段说这个问题多年来使科学家迷惑不解，但随后又说：Now they are beginning to fill in the blanks，这里“逐渐开始填补这些空白”意为“逐渐开始对此有所了解”。
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