单项选择题
哺乳期仔猪一般不容易患的疾病是
A． 仔猪白痢
B． 猪瘟
C． 仔猪红痢
D． 传染性胃肠炎
哺乳期仔猪一般不容易患的疾病是
A． 仔猪白痢
B． 猪瘟
C． 仔猪红痢
D． 传染性胃肠炎
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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
A. 
B. 
D. 