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托福阅读词汇题：unprecedented

2015-08-13 16:03:56来源：网络

　　【托福阅读题型：unprecedented词汇题】托福阅读中词汇题是重要题型之一。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词汇题

　　托福阅读词汇题：unprecedented

　　【Paragraph 4】This unprecedented development of a finite groundwater resource with an almost negligible natural　recharge rate—that is, virtually no natural water source to replenish the water supply—has caused water tables in the　region to fall drastically. In the 1930s, wells encountered plentiful water at a depth of about 15 meters; currently, they　must be dug to depths of 45 to 60 meters or more. In places, the water table is declining at a rate of a meter a year,　necessitating the periodic deepening of wells and the use of ever-more-powerful pumps. It is estimated that at current　withdrawal rates, much of the aquifer will run dry within 40 years. The situation is most critical in Texas, where the　climate is driest, the greatest amount of water is being pumped, and the aquifer contains the least water. It is projected　that the remaining Ogallala water will, by the year 2030, support only 35 to 40 percent of the irrigated acreage in Texas　that is supported in 1980.(Depletion of the Ogallala Aquifer)

　　The word “unprecedented” in the passage is closest in meaning to

　　○difficult to control

　　○without any restriction

　　○unlike anything in the past

　　○rapidly expanding

　　! The word “virtually” in the passage is closest in meaning to

　　○clearly

　　○perhaps

　　○frequently

　　○almost

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 词汇题

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