Drivers should drive when they are passing by a school.
A:terribly
B:quickly
C:slowly
D:freely
观察下面一列单项式:x,-12x2,14x3,-18x4,116x5,···
(1)计算这列单项式中,一个单项式与它前一项的商,你有什么发现?
(2)根据你发现的规律写出第n个单项式.
根据汉语意思完成句子
写出下列句子的意思。