【背景资料】某公司承建某综合楼，位于居民密集区域，总建筑面积250000m2。工程设计为钢筋混凝土框架结构，工期500天。现场临时供电设施按照供电设计和施工总平面图布置妥当，并制定了临时用点施工组织设计。在施工过程中发生如下事件： 事件一：2002年5月22日，在地下室有3名工人正在进行消防管道焊接作业，室内储存了2瓶氧气和2瓶乙炔，他们都已经过培训考核合格，但尚未取得特种作业操作证书，另外一名工人在墙角休息吸烟，结果造成爆炸事故。 事件二：进入装修施工阶段后，项目经理安排安全员王某负责现场的消防安全管理，王某随后在施工材料的存放、保管上作了严格的防火安全要求，现场设置明显的防火宣传标志，制定了严格的明火使用规定，整个装修阶段未发生一起火警。 请依据上述背景资料完成下列小题。
本案例中，在地下室进行焊接作业的动火等级为（）级。
A.一
B.二
C.三
D.四
参考答案：B
| 完形填空。 | |||
| Daniel is an American young man. He lives on the 1 floor of a tall building. His office is more than ten kilometers away. He must get up early 2 a quarter past six, and 3 home at seven. The lift takes him down. Then he 4 to the bus stop. The stop is only two 5 metres from the building. There he 6 No. 11 Bus. He begins 7 at eight and finishes it at five. Then he comes back. He takes the lift up to the 8 floor. Then he 9 up the three floors on foot, just for exercise. He cooks and eats his supper, and watches TV until 10 . After that Daniel usually falls into bed for night. | |||
| ( )1. A. fifte en ( )2. A. in ( )3. A. leave ( )4. A. walk ( )5. A. hundred ( )6. A. drives ( )7. A. to work ( )8. A. twelve ( )9. A. climb ( )10. A. nine twentieth | B. fifteenth B. on B. left B. run B. hundreds B. takes B. works B. fifteen B. jumps B. nine twenty | C. fiveteen C. about C. le aves C. went C. hundreds of C. by C. work C. twelfth C. go C. nine-twentieth | D. fiveteenth D. at D. lives D. walks D. hundred of D. catch D. worked D. fifteenth D. climbs D. ninth twenty |