题干
-- Oh, it's so disappointing that our team failed to win the final match!
-- Well, don't worry. _____.
A：Take things easy
B：Take your time
C：It isn't the end of the world.
D：That’s all right
答案(点此获取答案解析）
C
2P2O5中总结的信息有：①参加反应的物质是磷和氧气 ②反应条件是点燃 ③反应前后分子的总数不变 ④反应前后元素的种类不变。其中正确的是( )