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单选题
Why did the electric fence fail? It is because of _____.
A
The deer are smart
B
The winter is cold
C
The fence is of low quality
D
Snowpack serves as an insulator
参考答案
参考解析
解析：
文章第三段第三句话写到“…was that the insulating snowpack would prevent an animal from completing the circuit with the ground.”由此可见，由于积雪场绝缘，这样可以防止动物接触到地上的电路，D正确。
文章第三段第三句话写到“…was that the insulating snowpack would prevent an animal from completing the circuit with the ground.”由此可见，由于积雪场绝缘，这样可以防止动物接触到地上的电路，D正确。
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