My mother ____ busy last weekend. She ____ my grandma on Saturday morning. They ____ noodles together. ____ the evening, she ____ the clothes. She often ____ to the park, but she ____ my bedroom last Sunday. In the afternoon, she went shopping. She watched TV ____ me in the evening. She was very tired last weekend. So I'll help my mother do housework ____ weekend.

创建生态文明城市需要我们共同关注环境．我市某兴趣小组为了检测空气质量指数，设计了如图甲所示的检测电路，R为气敏电阻，其电阻的倒数与空气质量指数的关系如图乙所示，己知电源电压12V保持不变．R₀=5Ω，当电压表示数为4V时．求：

利用太阳能发电的最佳方式是光伏转换，就是利用太阳光照射到硅材料上产生电流直接发电。下图示意屋顶太阳能发电站。读图完成下列各题。