— What does your father do?
—
A:He is a teacher.
B:He is from China.
C:He is fine.
D:Thank you very much.
要想让一株苹果树结出不同品种的苹果,应采用的技术是( )
从夏、商的灭亡中,可以说明一个朝代的衰亡往往与下列哪个因素有直接关系( )