2017托福100篇阅读理解试题（五十四）

　　学科分类：Science

　　题目：Climate of the past

　　1. Ice layers can provide information of the past climate, top layers are

　　recently produced and bottom of the layers are formed for many

　　years.

　　2. Air bubbles in the ice can yield climate information as well. By

　　investing the gases in the bubbles, the correlation and connection of

　　carbon dioxide and temperature are revealed.

　　3. Some sea sediments can also tell information of the climate.

　　词汇题：

　　1. Compacted=compressed together

　　2. associated =related

　　3. sensitive to =responsible for

　　4. constructed=created