第11题: [单项选择]某项目排放的SO2最大地面浓度为0.45mg/m3,地面浓度达到0.05mg/m3时所对应的最远距离D10%为8km。已知《环境空气质量标准》中二级标准SO21h平均取样时间的浓度限值为0.50mg/m3,则该项目大气环境影响评价的等级为(
)。 A. 一级 B. 二级 C. 三级 D. 不能确定 参考答案:A
第12题: [单项选择]Hardly (did he hear) his mother's (calling) (when) he realized that (it was already dark). A. did he hear B. calling C. when D. it was already dark 参考答案:A 答案解析:应改为had he heard。固定句型Hardly had…when一……就,相当于as soon as…。