Passage comprehension I-20
A. Supplying blood for people who were in need
B. Providing a number of services for the public.
C. Helping the sick and wounded during a war.
D. Aiding people who were injured in an earthquake
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Passage comprehension I-21
A. The protection of prisoners of war.
B. The prevention of the outbreak of war
C. The signing of Genva Convention
D. The popularity of first aid knowledge
Passage comprehension I-22[音频]
A. The workers on the underground platforms were replaced by machines
B. It became the first completely automatic railway in the world.
C. A completely automatic line was added to its network.
D. Its trains became computer-controlled.
Passage comprehension I-23
A. The platform workers.
B. The computers.
C. The command spots.
D. The machines.
Passage comprehension I-24
A. To drive the train after it started automatically.
B. To start the train and to drive it when necessary.
C. To take care of the passengers on the train.
D. To send commanding signals to the command spot,
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