前方路口这种信号灯亮表示什么意思？

A、路口警示
B、加速直行
C、加速左转
D、禁止右转

—How many people are still leading ________ life under ________ poverty line in the world?

—Perhaps one fourth.[ ]

A. a; the  

B. a; a

C. /; /  

D. the; /