GRE Text Completion Question 1741
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Source: CQ
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.
| Blank(i) | Blank(ii) |
|---|---|
| A ability | D a useless |
| B reluctance | E a valuable |
| C unsuitability | F an undiscovered |