以下均是引起肺性脑病的机制，除了
A．高碳酸血症B．脑血流增加C．低氧血症D．脑水肿E．脑微血栓形成
参考答案：E
The reason he was late for school was he had to send his mother to a hospital.
A．which; that
B．why; that
C．for which; because
D．what; why
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