It is many years since we began to enjoy a _______ spring holiday each year.
A:two-month
B:two month
C:two months’
D:two-months
x=____
若直线l:ax+by+1=0(a>0,b>0)始终平分圆M:x2+y2+8x+2y+1=0的周长,则1a+4b的最小值为 ( )
文学常识填空。
《三峡》作者____,当代作家。