【托福阅读题型：Variations in the Climate句子简化题】托福阅读中句子简化题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子简化题

　　托福阅读句子简化题：Variations in the Climate

　　【Paragraph 3】Over long periods of time, substances whose physical and chemical properties change with the　ambient climate at the time can be deposited in a systematic way to provide a continuous record of changes in　　those properties overtime, sometimes for hundreds or thousands of years. Generally, the layering occurs on an　　annual basis, hence the observed changes in the records can be dated. Information on temperature, rainfall, and other　aspects of the climate that can be inferred from the systematic changes in properties is usually referred to as proxy data.　Proxy temperature records have been reconstructed from ice core drilled out of the central Greenland ice cap, calcite　shells embedded in layered lake sediments in Western Europe, ocean floor sediment cores from the tropical Atlantic　Ocean, ice cores from Peruvian glaciers, and ice cores from eastern Antarctica. While these records provide broadly　consistent indications that temperature variations can occur on a global scale, there are nonetheless some intriguing　differences, which suggest that the pattern of temperature variations in regional climates can also differ significantly from　each other.(Variations in the Climate)

　　! Which of the sentences below best expresses the essential information in the highlighted sentence in the　passage? Incorrect choices change the meaning in important ways or leave out essential information.

　　○ Because physical and chemical properties of substances are unchanging, they are useful records of climate　fluctuations over time.

　　○ For hundreds or thousands of years, people have been observing changes in the chemical and physical　properties of substances in order to infer climate change.

　　○ Because it takes long periods of time for the climate to change, systematic changes in the properties of substances　are difficult to observe.

　　○ Changes in systematically deposited substances that are affected by climate can indicate climate variations　over time.