[单选题]进行配电设备停电的营销现场作业前，应( )可能送电到营销现场作业设备各侧的所有线路（包括客户线路）断路器（开关）、隔离开关（刀闸）和熔断器，并验电、接地后，才能进行工作。
A.　连接
B.　断开
C.　阻断
D.　联系

What We Can Learn from Lei Feng
Lei Feng, a name known to almost each Chinese, has been a symbol of helpfulness since the AIF0s. Although he died quite young，he devoted his short life to doing countless good deeds. His behavior embodies many of our traditional virtues.
There are many things we can learn from him, such as patriotism, generosity, nobleness and deep love for ordinary people. Whatever job Lei Fei was assigned to, he would endeavor to do it well. The most important quality we should learn from him is the willingness to help those in need in our daily lives.
In contemporary China, people are getting increasingly money-minded. It is not uncommon for people to think of everything in terms of money. If all of us can take Lei Feng as a role model, we can help create a society of mutual care, where one’s value is judged by the contributions made to society. In this case, it won’t be long before China becomes a country in which more people will behave as Lei Feng did.