大豆机械播种时以当地日平均气温稳定通过5℃的（     ）%保证率之日期作为当地始播期为宜。
 
A、65 
B、70 
C、80 
D、90

A．.It’s fun, it works, it includes up-to-dated language and never forgets.
B．.It’s fun, it works, it mirrors culture, and not easy habit to learn English.
C．.It’s fun, it works, and too emotional.
D．.It’s fun, it enhances learning new information and an easy habit to do.

A．对
B．错

A. 第斯多惠
B. 夸美纽斯
C. 赫尔巴特
D. 杜威