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【单选题】
世界上第一条大陆桥运输线是（）。A.
西伯利亚大陆桥
B.
新亚欧大陆桥
C.
美国大陆桥
D.
加拿大大陆桥
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皮皮学刷刷变学霸
举一反三
【单选题】What is the author's purpose in quoting 'Of course, we can not imagine a life without any friend'?
A.
To show his sympathy for those who hasn't got any friends in life.
B.
To introduce the topic of the quality and quantity of friends.
C.
To disagree with the finding from the research.
D.
To show the author's surprise when heating the finding.
【单选题】Water and air are to human beings. We can not live without them.
A.
harbour
B.
function
C.
definite
D.
essential
【单选题】I型呼吸衰竭最主要的发生机制是
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