敷设在多尘和潮湿场所的电气保护管，管口与管子连接处、管子与接线盒、穿线盒的连接处要进行（）处理。
A、密封
B、防腐蚀
C、焊接
D、润滑
参考答案：A
The project _____ by the end of 2011, will expand the city’s telephone network to cover 2000000 users.
A．being completed
B．completed
C．to be completed
D．having been completed
小明经常长时间看漫画书而导致了近视，则他矫正视力时应配戴的近视镜是[ ]
A．凸透镜
B．凹透镜
C．平面镜
D．凹面镜
