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.
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单项选择题
Main types of pollution include smog, acid rain, the greenhouse effect, and holes in the ozone layer.
A．Y
B．N
C．NG
单项选择题
A．They are the parents of young children.B．They are professional storytellers.C．The stories will help them improve their vocabulary.D．The stories are required for a course.
A．They are the parents of young children.
B．They are professional storytellers.
C．The stories will help them improve their vocabulary.
D．The stories are required for a course.
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