2. 外语
  3. The passage is mainly about______. CPAP is a useful machine for people with snoring problems because it can help to______.

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

admin2010-12-04  37
问题 The passage is mainly about______.
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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大学英语六级

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