单项选择题

A．Selecting the necessary equipment.
B．Finding a climbing partner.
C．Attending the rockclimbing class.
D．Discussing popular climbing sites.
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单项选择题
A．It monitors the signals transmitted from the drivers brain.B．It can measure the driver’s alcohol level in the blood.C．It can quicken the driver’s response to emergencies.D．It bases its analysis on the driver’s heartbeat.
A．It monitors the signals transmitted from the drivers brain.
B．It can measure the driver’s alcohol level in the blood.
C．It can quicken the driver’s response to emergencies.
D．It bases its analysis on the driver’s heartbeat.
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