______ is medical technology that allows the prolongation of life artificially while the world is already over-populated

She ______ her vacation so much that she didn't want it...

单项选择题She ______ her vacation so much that she didn't want it to end.

I would like to say that a theory is essentially an abs...

单项选择题I would like to say that a theory is essentially an abstract, symbolic representation of reality.