单项选择题

A．One hour.
B．Half an hour.
C．Around 20 minutes.
D．As long as Susan wishes.
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单项选择题
A．It monitors the signals transmitted from the driver’’s 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 driver’’s 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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