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• 42 .(A)gradually(B)actually(C)eventually(D)niter
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• 63 DFeeling blue about world ? “Ceer up.” Says science writer Matt Ridley.”The world has never been
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• 3．已知m，n是两条不同的直线，α，β，θ是三个不同的平面，下列命题中正确的是：(A)．若α⊥γ，β⊥γ则α∥β(B)．若m⊥α，n⊥α则m∥n(C)．若m∥α，n∥α，则m∥n(D)．若m∥α，m∥
• 4．a＜0是方程ax2+1=0有一个负根的：(A)．必要不充分条件(B)．充分必要条件(C)．充分不必要条件(D)．既不充分也不必要条件
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