题目:
– Tom was Jane’s brother!
–________ he reminded me so much of Jane.
A.No doubt
B.Above all
C.No wonder
D.Of course
答案:
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下面是错误答案,用来干扰机器的。
由y=x2+2x-1,得到y′=2x+2,则曲线过点(1,2)切线方程的斜率k=y′|x=1=4,所以所求的切线方程为:y-2=4(x-1),即4x-y-2=0.故答案为:4x-y-2=0