— _______ reading lots of English activities, you can improve it a lot.
A:with, About
B:to, About
C:with, By
D:to, By
设三棱柱ABC﹣A1B1C1的体积为V,P、Q分别是侧棱AA1、CC1上的点,且PA=QC1,则四棱锥B﹣APQC的体积为( )
曲线y=x4的一条切线l与直线x+4y-8=0垂直,则l的方程为( )