单项选择题

A．To drive the car automatically.
B．To measure the driver’’s pulse.
C．To prevent car accidents.
D．To monitor the driver’’s health.
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单项选择题
A．They thought it was the weapon of the gods.B．They thought it was electricity.C．They thought it was firework of the gods.D．They thought it was a mystery.
A．They thought it was the weapon of the gods.
B．They thought it was electricity.
C．They thought it was firework of the gods.
D．They thought it was a mystery.
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