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【简答题】
已知两点F 1 （0，-2），F 2 （0，2），且点P到这两点的距离和等于6． （1）求以F 1 ，F 2 为焦点，且过点P的椭圆方程； （2）设点P（0，3），F 1 ，F 2 ，P关于直线y=x的对称点分别为P'， F ′1 ， F 2 ′ ，求以 F ′1 ， F 2 ′ 为焦点，且过点P′的双曲线方程．
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【单选题】Harvey finished ( ) his research paper, but he needed to check it before submitting it to the professor.
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【单选题】某《英汉辞典》在解释 “bus” 时,列出的义项有1公共汽车2火箭的一级3火车车厢4公共马车。如果按照历史上这些含义出现的先后来编写辞条,那么正确的排序应当是 ( )
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【单选题】Harvey finished ______ his research paper, but he needed to check it before submitting it to the professor.
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【单选题】某《英汉辞典》在解释“bus”时，列出的义项有①公共汽车②火箭的一级③火车车厢④公共马车。如果按照历史上这些含义出现的先后来编写辞条，那么正确的排序应当是（）
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【单选题】Harvey finished ______ his research paper, but he needed to check it before submitting it to the professor.
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B.
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D.
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【单选题】Harvey finished ____ his research paper, but he needed to check it before submitting it to the professor.
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【单选题】Harvey finished( )his research paper, but he needed to check it before submitting it to the professor.
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