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Recent research has identified ____________ bats' navigational tool, echolocation:smooth, vertical surfaces such as the metal or glass plates on buildings can trick a bat into thinking it is flying in open air.
- A.an explanation for
- B.a limitation of
- C.a principle of
- D.a symptom of
- E.a deficiency in
- F.a component of
B,E显示答案
以上解析由 考满分老师提供。
