As they access the corporate network, mobile and remote users inadvertently can infect the network with (72) and worms acquired from unprotected public networks.

A．viruses

B．disease

C．germs

D．sickness

垃圾填埋场的主要环境影响不包括( )。

A．填埋场渗滤液泄漏或处理不当对地下水及地表水的污染
B．填埋场的存在对周围景观的不利影响
C．填埋场机械噪声对公众的影响
D．流经填埋场区的地表径流不会受到的污染