I’m seeking the identification of an illustrated science fiction anthology I saw once in the children’s section of a library. This was back in the early 80s so the book was from that time period. I remember the ending of one story where some astronauts were walking along and a robot that was with them telling them to stop because there was danger up ahead. They laughed at the robot and told it there was nothing ahead of them. They kept walked and ended up stepping into quicksand. They begged the robot to help them, but the robot told them it wasn’t allowed to put itself into danger, so the astronauts ended up drowning.

I remember two illustrations from the book: one for the story mentioned, it was a drawing of the astronauts disappearing into the quicksand. The second illustration was of a dinosaur being scooped up by a payloader. I’ve wondered about this book for years. My Google skills have been fruitless, so if somebody here could figure this out for me I’d be ecstatic.