单项选择题

A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the fires.
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单项选择题
A．To prevent car accidents.B．To monitor the driver’’s health.C．To drive the car automatically.D．To measure the driver’’s pulse.
A．To prevent car accidents.
B．To monitor the driver’’s health.
C．To drive the car automatically.
D．To measure the driver’’s pulse.
单项选择题
A．Always try to make it across.B．Always try to brake and stop.C．Always try to accelerate.D．Always try to turn left.
A．Always try to make it across.
B．Always try to brake and stop.
C．Always try to accelerate.
D．Always try to turn left.
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