2013高考英语苏州市阅读理解（4）及答案（2012、12）
【山东省莱芜市凤城高中2013届质量检测】A
Some trees can survive a long time without water. Think of trees that grow in the desert. But other trees may need more moisture (水分)than they can get from rainfall or from the air .
Trees and other plants can look thirsty. Leaves can become weak and hang downward. They can also turn yellow. Yellowing can be a sign of too much water. But it can also be a warning sign of too little water.
With a newly planted tree, the roots have not yet spread out from the root ball. The root ball can become dry faster than the dirt around it. So put water on the area of the root ball and the surrounding soil until the roots become establis
