There _____ many new words in lesson one, so it is very easy.[ ]

A. is

B. aren't

C. isn't

D. are

男性，60岁，肥胖。睡眠时频繁翻身，肢体运动，时而惊醒，突然又落枕而睡，鼾声响亮，有时家人发现口鼻气流停止。自觉困倦无力，晨起头痛，记忆力、判断力下降。

目前常用的有效疗法是（）

A.经鼻持续正压气道通气

B.经口持续正压气道通气

C.经鼻持续负压气道通气

D.经鼻间断正压气道通气

E.经口间断正压气道通气