18. What are the sections of the earth's crust, often associated with volcanic activity, called?
这道题目首先要分析关键词：earth's crust, volcanic activity,called。
所以可以定为在section c中的第4段第3行：Look at maps of volcanoes, earthquakes and island chains like the Philippines and Japan, and youcan see the rough outllines of what are called tectonic plates-----the plates whcih make up the earh's crust and mantle.
虽然这句话里有些生词，但是应该能够选出，答案是tectonic plates板块构造
posted on 2006-11-17 22:04
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