—________. It's in the box.
A:Yes, it is
B:No, he doesn't
C:No, it isn't
我国山脉纵横交织构成了大地的骨架,山脉与山脉之间镶嵌这高原、盆地和平原,共同构成祖国的大好河山。读图4,完成下列问题