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单项选择题

___________ is an abnormally low level of oxygen in the blood. More specifically, it refers to oxygen deficiency in arterial blood.
A、Hypertention
B、Hypotension
C、Hyperemia
D、Hypoxemia

判断题

龟背竹叶片具椭圆形孔漏和羽状深裂，形似龟背，故称为龟背竹