There are some places in the world where great cities once stood. There were trees, gardens and grass. But now these cities have gone and the places are like deserts. Scientists began to study this land to find out what happened. Many of them believed the land died when the trees were cut down. Trees help other plants grow and help hold the soil in place. They keep the soil from blowing away. The leaves of trees on the ground keep rainwater from running off. Trees near farms protect growing plants from strong winds. Once there were hundreds of farms in the southwestern United States. Then the farms turned into fields of dry dust. Trees might have saved these farms. But few trees grow in the dry southwest now. Now we try to save trees. In many places, when a tree is cut down , a new tree is planted in its place . We do not want the land to die. Which is true ?
Trees let the rainwater run off . All the farms in the United States have turned into deserts . There aren't any trees in the dry southwest now . Land will die if there are no trees .
Question: There are some places in the world where great cities once stood. There were trees, gardens and grass. But now these cities have gone and the places are like deserts. Scientists began to study this land to find out what happened. Many of them believed the land died when the trees were cut down. Trees help other plants grow and help hold the soil in place. They keep the soil from blowing away. The leaves of trees on the ground keep rainwater from running off. Trees near farms protect growing plants from strong winds. Once there were hundreds of farms in the southwestern United States. Then the farms turned into fields of dry dust. Trees might have saved these farms. But few trees grow in the dry southwest now. Now we try to save trees. In many places, when a tree is cut down , a new tree is planted in its place . We do not want the land to die. Which is true ?
A. Trees let the rainwater run off .
B. All the farms in the United States have turned into deserts .
C. There aren't any trees in the dry southwest now .
D. Land will die if there are no trees .
Answer: