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【单选题】
已知命题甲：ab＞0；命题乙：方程ax 2 +by 2 =1的曲线是椭圆．则命题甲是命题乙的（　　）
A.
充分而不必要条件
B.
必要而不充分条件
C.
充要条件
D.
既不充分也不必要条件
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【单选题】Many a young person tells me he wants to be a writer. I always encourage such people, but I also explain that there's big difference between' being a writer' and writing. In most cases these individua...
A.
warn young people of the hardships that a successful writer has to experience
B.
advise young people to give up their idea of becoming a professional writer
C.
show young people it's unrealistic for a writer to pursue wealth and fame
D.
encourage young people to pursue a writing career
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【单选题】Many a young person tells me he wants to be a writer. I always encourage such people, but I also explain that there's a big difference between 'being a writer' and writing. In most cases these individ...
A.
warn young people of the hardships that a successful writer has to experience
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encourage young people to pursue a writing career
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【单选题】Many a young person tells me he wants to be a writer. I always encourage such people, but I also explain that there's a big difference between' being a writer' and writing. In most cases these individ...
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【单选题】Many a young person tells me he wants to be a writer. I always encourage such people, but I also explain that there's a big difference between 'being a writer' and writing. In most cases these individ...
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【简答题】根据句意及首字母提示补全单词。 1.— What ’ s the t_________ ?— I have a fever. 2.The bus driver is friendly to his p__ ___ ___. They all like him. 3.If you have a stomachache, you had better lie down and have a r____...
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【单选题】Many a young person tells me he wants to be a writer. I always encourage such people, but I also explain that there's a big difference between' being a writer' and writing. In most cases these individ...
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【单选题】Many a young person tells me he wants to be a writer. I always encourage such people, but I also explain that there's a big difference between 'being a writer' and writing. In most cases these individ...
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