問題詳情
11. Ptarmigan keep warm in the winter by
(A)huddling together on the ground with other birds.
(B)Building nests in trees.
(C)Burrowing into dense patches of vegetation
(D)Digging tunnels into the snow.
(A)huddling together on the ground with other birds.
(B)Building nests in trees.
(C)Burrowing into dense patches of vegetation
(D)Digging tunnels into the snow.
參考答案
答案：D
難度：困難0.333333
統計：A(2),B(0),C(0),D(1),E(0)
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