化学就在我们身边，它能改善我们的生活。现有以下几种物质：
A．食醋
B．氧气
C．干冰
D．熟石灰请选择适当的物质填空（填字母）：①抢救危重病人常用的物质是 ； ②可用于人工降雨的是 ；
③可以改良酸性土壤的是 ； ④厨房调味品中pH小于7的是 ；
（1） B （2） C (3) D (4) A
（1）氧气具有支持呼吸作用，故答案为B；
（2）干冰易升华吸收大量的热，可用于人工降雨，故选C；
（3）熟石灰呈碱性，可以改良酸性土壤，故选D；
（4）食醋呈酸性，PH<7，可作厨房的调味品，故选A.
Dear Dad, Happy birthday to you! On this special day, I’d like to talk to you 36 a special way. I don’t think I’m good at 37 you my thought (想法)face to face with you, so I’m writing to show my deep love for you. You aren’t a rich man or a famous person. But in my heart, you are one of the greatest 38 in the world. I’m 39 you. You are 40 interested in fame and wealth (名和利). You do 41 things like paying bills on time, and working as a worker in your factory. The smile on your face shows you are happy with the family. You take good care of my grandparents. You help me with my schoolwork and do some shopping with Mom on Sundays. In the past, I didn’t care 42 you were with me or not . Now I am sorry to say I 43 you the respect (尊重) before. But I am thankful for what you have done for me. I am quite lucky that I have 44 a great father. I want to let you 45 how much I love. You are a successful as a son, a husband, a father, and a friend. Yours, David”
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