单项选择题

仔猪红痢发病多在（）年龄。

A．不分年龄段均易发
B．生长猪时期
C．1-3日龄
D．7-10日龄

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单项选择题

According to the passage, which of the following statements about marriages is true

A．Marriages should become the center of one’s life.
B． Marriages can only solve the problem of loneliness.
C． Marriages can seldom solve people’s personal problems.
D．Marriages are not as important as success to the young.

区运煤上(下)山内设备的运输能力应[填空1]同时生产的工作面生产能力的总和。

答案：第1空:大于