单项选择题

A．People working in a large factory.
B．People walking on crowded city streets.
C．An everyday activity in a small town.
D．A well-known historical event.
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单项选择题
A．They ran a high fever.B．They died from excessive bleeding.C．Their nervous system was damaged.D．They suffered from heart-attack.
A．They ran a high fever.
B．They died from excessive bleeding.
C．Their nervous system was damaged.
D．They suffered from heart-attack.
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