04 Unit7 阅读理解12篇 There are places in North America where great cities once stood. There were gardens, trees and grass. But now these places are like deserts. Scientists began to study this land to find out what had happened. Many of them believe the land died when the trees were cut down. Trees help other plants grow. Tree roots (树根) hold the soil in place. They keep the wind from blowing away the soil. Leaves on the ground keep rainwater from running off. Trees near farms can help to stop strong winds. Once there were hundreds of farms in the northwest of the US. Then the farms turned into fields of dry land. This was because few trees grow there. Now we try to save trees. In many places, when a tree is cut down, a new tree is planted in its place. We don’t want the land to die. 1．Places where great cities stood are now like _____. A．forests B．deserts C．farms D．gardens 2．The underlined word “its” means _____. A．the old tree’s B．the new tree’s C．the place’s D．the land’s 3．Why are trees important A．Because they turn fields into dry land. B．Because they help other plants grow. C．Because they help strong winds blow. D．Because they keep rainwater running off. 4．What does the text tell us A．Farms are better than cities. B．There are no deserts in America. C．Lands will die without trees. D．All the trees are cut down. 5．Which of the following is TRUE according to the passage A．You can’t find any trees or grass in North America. B．Trees help us live a life as we are living now. C．Trees grow only in the deserts. D．Trees can blow soil away. Do you know why different animals or pests (害虫) have their special colors Colors in them seem to be used mainly to protect themselves. Some birds like eating locusts (蝗虫). But birds cannot easily catch them. Why It is because locusts change their colors together with the change of the colors of crops. When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night. If you study the animal life, you’ll find the main use of coloring is protecting themselves. Bears, tigers and other animals move quietly through forests. They cannot be seen by hunters. This is because they have the colors much like the trees. Have you ever noticed an even stranger act An octopus (章鱼) can send out a kind of very black liquid when it faces danger. While the liquid spreads over, the enemies cannot find it. And it immediately swims away. So it has lived up to now though it isn’t strong at all. 6．From the passage we learn that locusts _____. A．are small animals B．are easily found by birds C．are dangerous to their enemies D．change their colors to protect themselves 7．How can pests with different colors from plants keep out of danger A．They run away quickly. B．Their colors are l ... ...
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