in the derset 还是on the desert1.You may think there is only sand in the desert(沙漠) of the world2.These animals live on the desert plants for their food and do not need any water.这里为什么第一句用in the desert 第二句用on the deser

in the derset 还是on the desert1.You may think there is only sand in the desert(沙漠) of the world2.These animals live on the desert plants for their food and do not need any water.这里为什么第一句用in the desert 第二句用on the deser don't touch a child on还是in the head 是in the green T-shirt还是on the green T-shirt in the town还是on in还是on the blackboard in还是on the newspaper in the photos 还是on? on the shelf还是in the shelf? in the sofa 还是 on the sofa? in the day还是on the day? on the decline 还是in the decline on the land还是in the land?. in the playground 还是on the playgrand On the street 还是 in the street in the mountain还是on the mountain in the internet还是on the internet in the opposite还是on the opposite on the world还是in the world?