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A) They lost contact with the emergency department.
B. They were trapped in an underground elevator.
C. They were injured by suddenly falling rocks.
D. They sent calls for help via a portable radio.

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A. The majority of drivers prefer to drive and park themselves.
B. Human drivers become easily distracted or tired while driving.
C. Most drivers feel uncertain about the safety of self-driving cars.
D. Most drivers have test driven cars with automatic braking features.

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A. Serve standardised food nationwide.
B. Put calorie information on the menu.
C. Increase protein content in the food.
D. Offer convenient food to customers.

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