题目

―What _______ you to write? ―Sure, I would love to sell some songs someday, but that’s not why I do it. I enjoy it. A. motivates       B. reminds       C. suggests        D. supports   答案：A  物质发生化学变化时，反应前后肯定不变的是（    ）①电子总数②原子总数③质子总数④物质的总质量⑤物质的总能量⑥物质的种类A．①②③④⑤B．①②③④C．②⑤⑥D．③④⑤⑥