性 卷 货 取 夸
姓 圈 贷 最 跨
CaO+CO2↑ 分解反应
B . 用铁制容器盛装硫酸铜溶液:Fe+CuSO4═FeSO4+Cu 置换反应
C . 用焦炭把氧化铁中的铁还原出来:3C+2Fe2O3
4Fe+3CO2↑ 置换反应
D . 证明铝是金属活动性顺序表中氢前金属:2Al+6HCl═2AlCl3+3H2 置换反应
如图示消化系统局部结构,据图分析,下列叙述错误的是( )

旅游扶贫是通过挖掘贫困地区资源来发展旅游,带动贫困人口脱贫。恩施州地处湖北省西南部,州中南部四县根据各村的区位、产业、文化要素,将22个旅游扶贫村分为优势景区依托模式(临近或位于核心景区,为景区提供部分服务)、生态农业依托模式(开展农田和茶园观光、果蔬采摘、花卉苗圃观赏及销售等)、民宿农家乐依托模式(依托特色民居和餐饮发展农家乐、民宿和休闲娱乐项目)及民族文化依托模式(利用建筑、文学、传统礼仪、节庆、演艺等文化要素发展旅游)四种类型(下图)。优势景区、生态农业依托模式村居民的旅游经济效益更高。

简析优势景区依托模式、生态农业依托模式比民宿农家乐依托模式、民族文化依托模式居民的旅游经济效益高的原因。

There is an old saying: Early to bed, early to r ise, makes a man healthy, wealthy and wise. It means that we should go to bed early and get up early the next morning. By doing this, we will be in good health. And we'll also be rich and clever.
It's true that our bodies need to have enough sleep to be healthy. Children should have a ten- hour sleep every night. Those who do not have enough sleep can't do their work very well. They will not be clever and they may not get wealthy in the future.
The body needs exercise as well. Walking, running, jumping, riding bikes and playing games are all exercise. Exercise helps to keep the body strong and fit. It also helps the blood(血液) to move around inside the body. The head needs blood too. So exercise helps people think better.
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观察思考,填空空格:
排在第个和第个。
是第个分数和第个分数。
There is a bus stop near my home.
I live on Happy Street.
Hello! My name's Billy.
And I'm a primary school student.
I go to school by Bus No. 3.
根据上面的数据:
马每分约跑千米;
非洲象每分约跑米;
上面的三种动物,跑得最快的是.