企鹅爸爸靠消耗体内脂肪产生的热量来孵蛋，孵蛋时，企鹅爸爸要在狂风呼啸的风雪中一动不动的站立多少天？
参考答案：40-50天。
“Never for a second,” the boy says, “______ that my father would come to my rescue.”
A．I doubted
B．do I doubt
C．I have doubted
D．did I doubt
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