假设你是中国秦朝的丞相，当你与同时期的罗马元老院成员相遇时，在治国原则上的最大分歧是

小敏在今年的校运动会跳远比赛中跳出了满意一跳，函数$h=3.5t-4.9t^2$（的单位：秒，h的单位：米）可以描述他跳跃时重心高度的变化，则他起跳后到重心最高时所用的时间是（　　）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；2）只允许修改10处，多者（从第11处起）不计分。

    Last week, our teacher offered us an answer to a difficulty maths problem in class. Though an answer seemed a little strange, but nobody doubted it except me. Thinking that his answer might wrong, I carefully studied the problem and tried to work them out in a different way. Half an hour late, I managed to find the correct answer. When I show my answer to him, my teacher praised me of my independent thinking.

    From this experiences I have learnt that questioning can serve as a bridge that help us to find the truth.