计算机网络是由负责信息处理并向全网提供可用资源的资源子网和负责信息传输 【7】 子网组成。
参考答案：通信
On Sundays there were a lot of children playing in the park, _______ parents were seated together joking.
A．their
B．whose
C．which
D．that
沙粒移动方式有哪几种？为什么说跃移是沙粒运动的最主要形式？
