Mr. Swiecki says this is true especially in Mediterranean and semi-dry climates. Many trees in these climates have adapted to having a dry area near their base during the hottest season. He said, "Water displaces (取代，排出)air in the soil. And roots are aerobic（需氧的）; they require oxygen for the soil to function properly. So if you keep the soil completely wet and there's no air there, then the roots are starving for oxygen."

　　56.What is the passage mainly about?

　　It introduces to us different kinds of trees

　　It instructs us how to water trees correctly

　　It teaches us how to tell whether a tree needs water

　　It analyses why different trees need different amounts of water

　　57.What does the underlined word “this”in the last paragraph refer to ?

　　Water displaces air in the soil

　　Many trees have got used to dry soil

　　Organisms can invade the soil that is too wet

　　Water established trees at the base of trunks

　　As to a well-established tree,

　　.

　　watering deeply matters more than watering often

　　we should water them as often as possible

　　its roots have not spread out from the root ball yet

　　a deep watering satisfies it for at most ten days in cold weather

　　59.Which of the following situations requires the most watering?

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