单项选择题

A．By ＄150.
B．By ＄215.
C．By ＄6,750.
D．By ＄5,300.
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单项选择题
A．An overall rise in blood pressure and heart rote.B．There is no change in blood pressure and heart rate.C．A drop in blood pressure but a rise in heart rote.D．An overall drop m blood pressure and heart rote.
A．An overall rise in blood pressure and heart rote.
B．There is no change in blood pressure and heart rate.
C．A drop in blood pressure but a rise in heart rote.
D．An overall drop m blood pressure and heart rote.
填空题
This passage is mainly about______.
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