第19题 (2.0) 分 “未有天地之先，毕竟是先有理”，这是一种（ ） A、朴素唯物主义观点 B、客观唯心主义

B。此题中的“天地”代表物质，“理”应是和朱熹口中的“理”是一样的，是一种客观精神，那么这句话的意思是：在没有物质之前就存在一种客观精神了。典型的意识第一性观点，是唯心的且是客观的

以The Most Unforgettable person I Ever know为题目写一篇不少于100词的作文

In my life I have met a great many people who are really worth recalling. But perhaps the most unforgettable person I ever know is my English teacher. What frequently brings back memories of my school teacher is his special qualities. First and foremost, he gave us the greatest gift a teacher can offer—an awakening of a passion for learning. He not only led us to an appreciation of the beauty and perfection of English language and literature, but also aroused our great interest in exploring something deeper in this field. Furthermore, I was attracted by his lively wit. I remember that we students always anticipated his class with great eagerness because his lecture were humorously delivered, never failing to provoke chuckles or loud laughs. Although it is nearly two years since I attended his last class, he is the talk of our old classmates, and I know part of him has already stayed in my heart. 

铁与硫酸反应（化学方程式）

1.Fe与过量浓硫酸反应：
2Fe＋6H2SO4（热、浓）＝Fe2（SO4）3＋3SO2（气）＋6H2O
2.当Fe过量时，硫酸会变稀，这时发生的就是Fe与稀硫酸的反应了。
（1）铁与稀硫酸反应：Fe＋H2SO4＝FeSO4＋H2（气）
（2）铁与Fe2（SO4）3反应：Fe+Fe2（SO4）3＝3FeSO4
3.Fe遇冷、浓硫酸钝化参考资料：↑