"Delicate" means something finely made, while "dedicate" means being devoted to something.

Natural, finely tuned patterns of human reproduction have ______ by settled agriculture and urban living.

If the detergent type lubricating oil being used in a diesel engine is black, the oil （） A: must be centrifuged B: must by filtered C: must be changed D: is holding finely dispersed carbon in suspensio