媒体应有的专业素养与（  ）。

单项选择题下列哪些可以作为识别滑坡的重要标志?①滑坡体、滑坡壁、滑动面；②滑坡台地、鼓张裂隙③滑坡床、拉张裂隙；④扇形裂隙、剪切裂隙。A、①②③B、①②C、②③④D、①②③④

单项选择题‏Intertidal organisms from exposed areas sometimes have thicker shells than their counterparts from less exposed areas. This is thought to be an adaptation to: ‌