A:7m/s2
B:5m/s2
C:1m/s2
D:8m/s2
— It's kind you to help me.
— Don't mention it.
世界上人口自然增长率最高的大洲是( )
读《乞丐》,课文通过写____的故事,表现了人与人之间应该充满关切与理解的思想,弘扬了高尚的____精神。