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【单选题】
快反应自律细胞4期自动除极主要是由于:A.
If通道开放使钠离子内流逐渐增强
B.
T型钙通道的激活和钙离子内流
C.
持续的钾离子内流
D.
钾离子外流减少
E.
氯离子外流
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举一反三
【单选题】The 9/11 terrorist attack _________ the whole world.
A.
rewarded
B.
stunned
C.
exaggerated
D.
emerged
【简答题】The 9/11 terrorist attack ____the whole world.
【简答题】The
World Trade Center was a place _______ was destroyed by the 9/11 terrorist
attack.A. where B. that C. / D. there
【单选题】The 9/11 terrorist attacks changed the lives of many Americans in a(n)________way.
A.
profound
B.
process
C.
profounding
D.
profoundly
【单选题】On the scene of the disaster of the 9/11 terrorist attack, Picciotto ___________________.
A.
had always been frightened he might not survive
B.
was more frightened than he had ever been in his life
C.
was the person who first used the phrase "I'll see you at the big one"
D.
felt he could do nothing to protect himself
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