[单选] 毛泽东第一次明确提出社会主义社会存在敌我矛盾和人民内部矛盾的观点的著作是（　　）

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• [单选] I remember _______ her at the party last week．
• [单选] I have four letters to write today and I have finished_________．
• [单选] His hands _______ a little as he took up a pen and began to write．
• [单选] ________at his model plane over the weekend，he didn’t complete it．
• [单选] I looked and looked，and at last I made out two figures moving slowly in the _______.