单项选择题

A．Stop the flow of blood if the person is bleeding.
B．Do operation whenever necessary.
C．Do artificial respiration if the person has stopped breathing.
D．Do the best you can until a doctor arrives.
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单项选择题
A．It affects the growth of trees.B．It has been increasing since the Ice Age.C．It is determined by the chemicals in the air.D．It follows a certain cycle.
A．It affects the growth of trees.
B．It has been increasing since the Ice Age.
C．It is determined by the chemicals in the air.
D．It follows a certain cycle.
填空题
struck
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