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三、运用构词法、语境线索等帮助来推测关键词义
在阅读文章的过程中，常常会遇到一些生词，如果不懂得这些词义就会妨碍理解，但大部分生词的词义是可以根据上下文，结合构词法、借助文章中的语境线索帮助在理解基础上猜测其词义，这有助于加快阅读速度，提高阅读理解能力。如：
Water is all around us. Water is in the ocean. Water is in the lakes and rivers. Water is in the air. There is more water than land on the earth. All living things must have it. We must have it, too. We cannot live without drinking water. Sometimes, we do not have all the water that we need. The land will dry up without water. Sometimes, there can be too much water in the land. If it rains very, very hard, the rain water will run down the hill. It takes some of the land with it when it runs down the hills. It is called erosion when the water takes the land away.
“Erosion” in the passage means ____________.
A. 地震 B. 雪崩 C. 侵蚀 D. 霜冻
