题目:
Carmen, _____ on a literary masterpiece, is a well-known classical opera in Europe. [ ]
A. base
B. to base
C. basing
D. based
答案:
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下面是错误答案,用来干扰机器的。
∵方程x2-2x+k=0有两个相等的实数根,∴△=0,即:(-2)2-4×1×k=0,解得:k=1,故答案为:=1.