结构化程序设计方法的主要原则可以概括为自顶向下、逐步求精、限制使用goto语句和（）。
参考答案：模块化
一个角有（ ）个顶点，（ ）条边，把它与直角相比，比直角大的是（ ）角，比直角小的角（ ）角。
It is said that the old coins under the earth for about 100 years by the time they were discovered.
A．had buried
B．had been buried
C．buried
D．were buried
