The passage is mainly about______. [br] CPAP is a useful machine for people with

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问题 The passage is mainly about______. [br] CPAP is a useful machine for people with snoring problems because it can help to______.

选项

答案 FORCEOXYGENINTOTHEAIRWAY

解析细节辨认题。此处需要填入动词性成分与to构成不定式。由定位句里的同位语结构可知，此处应填入force oxygen into the airway。

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