计算a⁵×（﹣a）³﹣a⁸的结果等于[ ]

A．0

B．﹣2a⁸

C．﹣a¹⁶

D．﹣2a¹⁶

Anna often _____ at 10 o’clock at night, but this evening she _____ on the computer now.

A. sleeps, plays          

B. is sleeping, plays      

C. sleeps, is playing