题目

下面列举的各种现象中，能说明物质是由分子构成的是A. 铁铲用久了，会变薄 B. 博物馆门前铜像的手被人摸久了，会变小C. 秋风一吹，树上的叶片渐渐变少了 D. 屋檐下的石块，出现了“滴水穿石”的现象 答案：【答案】ABD【解析】物质是由分子组成的，分子是由原子组成的．A. 铁铲用久了，由于与地面摩擦，质量会变小会变薄，能说明物质是由分子构成的，符合题意。B. 博物馆门前铜像的手被人摸久了，与手摩擦质量会变小，能说明物质是由分子构成的。符合题意。C. 秋风一吹，树上的叶片被吹走了，渐渐6、M: I haven’t seen you for a long time. Where have you been? W: I went to New York to visit my sister and stayed there for two months. Actually, I really went to meet my new nephew. (www.nmet168.com) M: That’s great! How old is he? W:  Well. He was five months old when I got there. And he could possibly be the most beautiful baby I have ever seen. M: What did you do in your sister’s home? W: I helped the baby and played with him a lot, which was nice. But what I enjoyed most was feeding him. 6. Why did the woman go to New York?    A. To spend some time with the baby.    B. To look after her sister.    C. To find a new job. 7. How old was the baby when the woman left New York?    A. Two months.                  B. Five months.            C. Seven months. 8. What did the woman like doing most with the baby?   A. Holding him.                   B. Playing with him.         C. Feeding him.