教育必须遵循儿童生理心理发展的（），满足儿童发展的需要。
参考答案：自然规律
数值函数Int(数值表达式)返回数值表达式值的 ______。
A．绝对值
B．符号值
C．整数部分值
D．小数部分值
______ provided the methodological foundation for materials for the teaching and its principles formed the basis of such widely used series as English 900 and Success With English.
A．The Direct Method
B．The Oral Approach
C．The Audiolingual Method
D．The Communicative Approach
