2. 外语
  3. The (i)______of homing pigeons to sense Earth’s magnetic field may serve as (ii)______ tool in helping them find their way home,

The (i)______of homing pigeons to sense Earth’s magnetic field may serve as (ii)______ tool in helping them find their way home,

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问题 The (i)______of homing pigeons to sense Earth’s magnetic field may serve as (ii)______ tool in helping them find their way home, even across hundreds of miles.
选项
答案A，E
解析 ability能力，reluctance勉强，unsuitability不恰当；useless无用的，valuable有价值的，undiscovered未被发现的。代入选项，答案选AE。
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