单项选择题

A．Now, there are no wins and people live in a peaceful world.
B．More children can live to their adulthood and have their own children.
C．People live longer now than in the past.
D．People immunize many fatal diseases of which many people die
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单项选择题
A．It has lost its primary 6xygen sources.B．It has lost its backup oxygen sources.C．It has lost both the primary and the backup oxygen sources.D．It has last neither the primary or the backup oxygen sources.
A．It has lost its primary 6xygen sources.
B．It has lost its backup oxygen sources.
C．It has lost both the primary and the backup oxygen sources.
D．It has last neither the primary or the backup oxygen sources.
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