单项选择题
对猪丹毒最敏感的实验动物是( )
A、小鼠和鸽
B、小鼠和豚
C、豚鼠和兔
D、兔子和鸽
对猪丹毒最敏感的实验动物是( )
A、小鼠和鸽
B、小鼠和豚
C、豚鼠和兔
D、兔子和鸽
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单项选择题
In which year the world's population lived in urban areas is more than 50% for the first time in history?
In which year the world's population lived in urban areas is more than 50% for the first time in history?
A.2007
B.2000
C.2010
D.2005