题目

The moment I stepped off the plane after a writer’s conference, my youngest son Jeremy greeted me and cried out, “Poster paper, Mama! I need poster paper. We’re having a   36   at school.”     Being a housewife and writer, I felt like no matter how hard I tried, I couldn’t keep up with the needs of my   37   . Back at home, Jeremy kept reminding me of the poster paper, but I just couldn’t   38   a minute for it. Gradually though, he began to speak more  39   , almost  40   he were talking to himself. Maybe he’ll just forget it, I thought hopefully. 右图是元素周期表的一部分。（1）原子序数为15的元素属于（填“金属”或“非金属”）          元素。（2）Al2O3中铝元素的化合价为         。（3）硼元素的原子核外有        个电子。