题目

- Since January, many cities in China have been a lot of foggy days.-Yes, could you tell me_________?         A．how should we deal with PM2.5 pollution  B．what should we do with PM2.5 pollution           C．how we should do with PM2.5 pollution   D．what we should do with PM2.5 pollution 答案：D解方程（1）28.25﹣X=8.25，（2）X﹣（3.6+2.97）=12.42，（3）x+30%x=26，（4）÷x=，（5）14.5=5.5，（6）x﹣80%x=48，（7）75%x﹣5×=6，