试题要求：
Hawaii islands are formed by_____.
试题解析：
答案：D
解析：
题目大意：夏威夷岛由什么形成。结合第二段" The islands were formed by volcanoes that erupted（爆发）and rose above the ocean."该句可知夏威夷岛由会爆发的火山组成，故选D。
考点：概括段落大意和补全句子,2018.10
Hawaii islands are formed by_____.
题目大意：夏威夷岛由什么形成。结合第二段" The islands were formed by volcanoes that erupted（爆发）and rose above the ocean."该句可知夏威夷岛由会爆发的火山组成，故选D。