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【单选题】
Why does the professor mention paper clips?A.
To make an analogy to atoms.
B.
To do a chemical experiment.
C.
To show the usage of paper clips.
D.
To provide some useful stationery.
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【单选题】The river is said __________ in a fire during the past 10 years.
A.
to have polluted
B.
it has been polluted
C.
to pollute
D.
to have been polluted
【多选题】男性，60岁，咳嗽、咯血、体重减轻两个月。吸烟40年，每天1包。入院查CT、MIR示右下肺癌，拟行右下肺叶切除术。患者如期手术，麻醉行双腔气管插管，下列哪些是单肺通气的绝对适应证（）。
A.
肺脓肿，脓液量超过50ml
B.
肺泡蛋白沉积症
C.
大咯血
D.
食管癌切除
E.
肺叶切除
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