When a person breathes through his or her nose, the air is warmed and humidified on its way from the nostrils to the throat. ______________ particles are filtered out by the mucosal surface, and thereby prevented from reaching the lungs.

单选题

When will a person meet with a life-threatening situation?

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问答题

person

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when

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材料题

my business card,reminding him that he had a meeting. You have a meeting with Jeff Hoye at 2:30 p. m.I took a deep breath,pushed open the doors of the auditorium and walked straight up the middle aisle（过道）toward him as he talked .Mr. Weatherup stopped._____(3)Just before I reached the door,I heard him tell the group that he was running late.He thanked them for their attention,wishedthem luck and walked out to where I was now sitting,holding my breath.He looked at the card and then at me.Let me

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