儿童鼻出血部位大多发生在(),过去认为中老年病人鼻出血部位多见于鼻腔后部的()出血,现在发现()动脉出血也多见。
参考答案:鼻中隔前下方;鼻-鼻咽静脉丛;鼻中隔后部
—Where will you start your work after graduation?
—Mmm, it's not been decided yet. I ____ continue my study for a higher degree.
A.need
B.must
C.would
D.might
花青素是怎样决定植物花朵颜色的?