选出你所听到的句子( )
A:Great inventions change the life and help people live a better life.
B:Great inventions change the world and help people live a better life.
C:Great inventors change the world and help people live a better life.
人口自然增长率最高和最低的大洲分别是( )
读南方地区图,完成下列各题.
— How much is the ____?
— ____ yuan.