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题型：单选题 题类：常考题 难易度：普通
四川省苍溪县东溪片区2018届九年级上学期英语第一次月考试卷
— Try again, please.
—Now it is three months old. In the past three months, its weight has increased to six kilos.
—It is said that they live in the world that is undiscovered.
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