B．Guardians at the gate

　　C．Saving nuclear power station

　　D．Using nuclear power safely

　　解析：选B。主旨大意题。通读全文可知，本文主要讲述了五十几位核电站工人保卫核电站的事迹。故B项符合题意。

　　E

　　The “Neighborhood Watch” scheme all started a few years ago in the quiet village of Mollington after a number of burglaries in the village and the surrounding area.The villagers came up with the idea that they themselves could keep an eye on their neighbors’ possessions while they were away on holiday.Since then，and with the support of the government and police，more than 50,000 “Neighborhood Watch” schemes have been set up all over the country.

　　The object of each “Watch” group is to reduce the opportunities that criminals have in any particular street or area.Each villager who is a member of the scheme will call the police whenever they see something suspicious.It is the police who actually check out each report and look into what is happening.Villagers who are part of the “Watch” are not supposed to act as police or put themselves in danger.

　　When a new “Neighborhood Watch” scheme is set up in an area，one benefit is that most burglars dare not take a chance on breaking into someone’s house because they know that there is a high risk of being seen by neighbors keeping a lookout.Burglars also know that people are more likely to have fitted good locks to their doors and windows.

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