Why did the author do the self-experiment of plugging off the Internet for one month?

Almost all bio-film system work well for de-nitrification, as long as oxygen transfer can be kept to a minimum and plugging does not occur. ( )

The electric motor gets its electric power from a high-voltage battery pack which is recharged by plugging into standard 220-volt outlet．

Keeping your laptop _______ all the time will kill its battery faster. A: made waves B: plugging in C: plugged in D: making waves

A plug-in hybrid, also called plug-in hybrid electric vehicle (PHEV), has a large battery pack that can be recharged directly from household electricity or a charging pile in public place by plugging into an electric outlet (see Fig.8-5) ．

Small oil spills on deck can be prevented from contaminating any waters by （）. A: plugging all scuppers and drains B: placing floating booms around the ship C: regularly emptying all drip pans D: thoroughly draining all bunkering hose

 The company has doubled its profits since _____ into lucrative overseas markets.  未知类型：{'label': 'questionDesc', 'content': '根据句意，选择合适的单词或短语', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '英语二2015年完型', 'isMemberControl': 0, 'type': 181} A: plugging B: beating C: guiding D: bringing