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【单选题】
右侧心力衰竭的主要X线表现为A.
心脏房室增大
B.
上腔静脉扩张
C.
胸腔积液，膈肌升高
D.
奇静脉扩张
E.
以上都是
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【简答题】阅读理解。 Death Valley is one of the most famous deserts in the United States, covering a wide area with its alkali sand. Almost 20 percent of this area is well below sea level, and Badwater, a salt water...
【单选题】The area is ______ with trails, some as wide as boulevards, that have been cut and maintained by elephants.
A.
blackmailed
B.
latticed
C.
isolated
D.
galloped
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