如图所示光路图中，能正确地表示光从水斜射入空气，在水面发生折射的是（ ）
A：
B：
C：
D：
①社会劳动力缺乏 ②劳动力素质低
③社会养老负担加重 ④经济发展下滑。
我来算一算。
2角+5角=____角 7元+3元=____元 14元-8元=____元
9角-4角=____角 3角+7角=____元 1元-6角=____角
3元2角+6角=____元____角 7元8角-4角=____元____角
Do you often watch TV? Maybe your 1 is "Yes". Most children like watching TV 2it's interesting and relaxing. They can also learn a lot and know3 things about their country and the world. TV helps to open children's eyes. TV can open 4mind. They can learn some better ways of 5 things. Many children are always6 with their studies, so they watch TV only on weekends. 7 some children watch TV every night. They go to 8very late and they can't have a good rest. I 9 it's good to do so. What do you 10 it?
