对计算机网络安全构成威胁的因素可以概括为：偶发因素、自然因素和（）三个方面。
参考答案：
In no city of China _____ little about the economic development．
A．the government cares
B．does the government care
C．doesn’t the government care
D．the government doesn’t care
累赘léi zhuì
