She told me she wanted to ________ her two o’clock appointment in order to take care of her sick.

A．have broken down

B．have broken out

C．have broken in

D．have broken up

上图乙图中铜片的红磷不燃烧而白磷燃烧，说明可燃物要燃烧，需要_  _                            __和_                               __。