题目

怎样正确理解连通器原理？  答案：理解连通器原理时，要注意下列两个条件：一是“连通器里只有一种液体”，二是“在液体不流动的情况下”．只有满足这两个条件，各容器中的液面才保持相平，否则，如果连通器里有几种液体，或者液体还在流动，那么各容器中的液面，就可能不会保持相平解析:略 完形填空 从每小题A，B，C，D四个选项中选择能填入相应空白处的最佳答案。（10分）               Pleasant Sheep 喜羊羊                  Pretty Sheep 美羊羊Hi! I’m Pleasant Sheep. I’m __小题1:___ boy. I’m seven __小题2:__ old. I have a    小题3:  mouth, and my 小题4: are big. My nose is small. I have four good  小题5: .We are movie stars(电影明星).We are   小题6:  the same class. They are nice to me. Pretty Sheep is my 小题7:   friend. She is a nice girl. Does she have big eyes? Yes, she 小题8: big eyes, too. Our （我们的）monitor(班长) is a girl. She is eight years old. She has a big head,  小题9:_  her eyes are small.   小题10: , who is she?小题11:A．aB．anC．theD．/小题12:A．yearsB．yearC．/D．ear小题13:A．smallB．longC．wideD．short小题14:A．noseB．eyesC．legD．hand小题15:A．students B．teachersC．carsD．friends小题16:A．atB．onC．inD．to小题17:A．bigB．goodC．niceD．small小题18:A．haveB．hasC．amD．is小题19:A．too B．butC．inD．from小题20:A．GuessB．Thank C．Know D．Meet