设曲线y=xn+1（n∈N*）在点（1，1）处的切线与x轴的交点的横坐标为xn，令an=lgxn，则a1+a2+…+a99的值为（ ）。
-2
估一估，把得数小于50的算式写在横线上。
3×3+10 4×4+30 4×6+25 2×3+6 33+40 8+8+8 27+30 42+20
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_____, everyone in my class likes our English teacher. [ ]
A. To be honest
B. To one's surprise
C. In honest
