以下关于经验概括的说法正确的是( )
A.属于在经验层次上对社会现象的反映 B.属于理论层次的概括C.其抽象和概括的程度较高 D.要求使用抽象的概念
参考答案:A
看图,根据已给的首字母,将句子补充完整。
What can you see in the picture?
1. I can see the s____________. (太阳)
2. I can see the s____________. (小溪)
3. I can see some b____________s. (小鸟)
4. I can see some m____________s. (山)
5. I can see a b____________. (桥)
6. I can see a l____________. (湖)
7. I can see some t____________s. (树)
8. I can see a r____________. (彩虹)
求证:如果一条直线和两个相交平面都平行,那么这条直线和它们的交线平行.