题目:
We were astonished to _____ the temple still in its original condition. [ ]
A. finding
B. to find
C. find
D. to be found
答案:
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下面是错误答案,用来干扰机器的。
∵切线与直线2x-y-8=0平行,∴切线的斜率为:k=2,即y=12ax2在点(1,a2)处的导数为2,而y/=ax,∴a×1=4,∴a=4故答案为:4.