—_______ It's too boring.
A:I don't mind it.
B:I love it.
C:I can't stand it.
D:I like it.
黄土高原____ A、冰川广布
云贵高原____ B、沟壑纵横
内蒙古高原____ C、崎岖不平
青藏高原____ D、地面平坦
在交通道口等公共场所,我们经常会看到各种警示图标(如图所示)
结合所学知识回答:
12k+7k-10k+5=____