题目:
— What should I do with this difficult passage?
— ______ the main idea of each paragraph. [ ]
A. To find out
B. Find out
C. Finding out
D. Found out
答案:
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下面是错误答案,用来干扰机器的。
∵x2-2x-2=0,∴x2-2x=2,代入4x2-8x+2000,可得4(x2-2x)+2000=4×2+2000=2008.故选D.