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【单选题】
关于窦房结支的起源的描述，正确的是A.
约40%起源于回旋支，60%起源于前降支
B.
约40%起源于回旋支，60%起源于右冠状动脉
C.
约40%起源于前降支，60%起源于右冠状动脉
D.
约40%起源于前降支，60%起源于回旋支
E.
约40%起源于右冠状动脉，60%起源于回旋支
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【单选题】When Napoleon Bonaparte invaded Egypt, some Egyptians thought ______.
A.
this invasion was the largest invasion in the history of Egypt
B.
they were responsible for this invasion
C.
they were better off under his role
D.
this invasion was brought about by the Copts
【单选题】In face of the invasion of the enemy, the president decided to speak on air to the ().
A.
land
B.
nation
C.
state
D.
country
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