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

admin2009-05-28  53
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 are beginning to fill in the blanks.
   Not long ago, experiments showed that birds depend on the sun to guide
选项 A、has been discovered recently
B、is known by everybody
C、still remains a mystery
D、has been known to scientists for years
答案A
解析
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