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【单选题】
心源性呼吸困难最严重的为（ ）。A.
心源性哮喘
B.
端坐呼吸
C.
急性肺水肿
D.
阵发性夜间呼吸困难
E.
劳力性呼吸困难
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皮皮学刷刷变学霸
举一反三
【单选题】We’d love to help visitors travel around this ________ underwater world.
A.
wonderful
B.
worldwide
C.
worthwhile
D.
windy
【单选题】The underwater world is perhaps the most popular place _________ people, esp. youngsters prefer to visit.
A.
that
B.
where
C.
in which
D.
what
【单选题】Why did the U.S. Navy set up underwater microphones around the world in the 1960s?
A.
To listen for changes in ocean structure.
B.
To listen for changes of ocean currents or volcanic activity.
C.
To make sure whether there was a giant squid deep in the ocean.
D.
To follow the track of the Soviet warships under water.
【简答题】The underwater part of an iceberg is ______.
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