计算：（a2）3÷a2=_______．
（a2）3÷a2，
=a6÷a2，
=a6-2，
=a4．
故答案为：a4．
民谚有“础润而雨”的说法，作为劳动人民千百年来宝贵劳作经验的总结，它的主要科学依据体现在( )的变化通过“础润”的形式表现出来，从而预示着天气的变化。
A．温度 B．湿度 C．气压 D．风向
The boy seemed _____ when he got up this morning, so his mother was very womed.[ ]
A. weak
B. weakly
C. strong
D. strongly
