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单选题
Recent findings indicate that birds can also use the magnetic field of the earth as an aid to _____.
A
criterion
B
orientation
C
standard
D
guideline
参考答案
参考解析
解析：
句意：最新的研究成果显示鸟类也可以利用地球磁场来帮助自己定位。orientation方位。criterion标准。standard标准，规范。guideline指导方针。
句意：最新的研究成果显示鸟类也可以利用地球磁场来帮助自己定位。orientation方位。criterion标准。standard标准，规范。guideline指导方针。
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