2016年10月30日GRE閱讀真題回憶
　　短文章：
　　For years, the leading theory for what caused the Younger Dryas (a dramatic reversal, about 12,900 years ago, in a global warming trend) was a release of water from Glacial Lake Agassiz. The theory posited that this meltwater flooded into the North Atlantic, lowering the salinity and intensity of surface waters enough to prevent them from sinking. Ocean currents were changed in such a way that northward transport of heat in the ocean diminished, and the North Atlantic regions plunged back into near-glacial conditions. However, evidence has emerged that the Younger Dryas began long before freshwater flooded the North Atlantic. Additionally, the temperature changes included by a shutdown in the North Atlantic heat conveyor system are too small to explain the Younger Dryas.
　　1.The author of the passage implies which of the following about the release of water from glacial Lake Agassiz?
　　A. The notion that the release occurred has been challenged by more recent findings.
　　B. The release probably occurred much earlier than scientists have generally assumed.
　　C. The release would not have been sufficient to cause any temperature change in the North Atlantic.
　　D. The timing of the release is such that it probably did not trigger the onset of the Younger Dryas.
　　E. The release was probably unrelated to the global warming trend that was taking place.
　　答案：選D.
　　解析：問下面哪個是作者暗示的和放水相關的.D說放水時機是這樣的因此不可能帶來YD的開始，完美符合選文中轉折后面放水YD之后的描述。A選項質(zhì)疑放水這件事的發(fā)生時原文沒提及的。B說放水比科學家所普遍假設的要早，如果把科學家普遍假設和leading theory放在一個隊伍的話，他們之前認為放水帶來YD，那他們肯定認為放水要早咯，而實際YD要更早，那實際放水時間肯定比科學家假設的要晚。C選項錯在any,太絕對了，沒說放水一點溫度變化也不能帶來。E選項文章沒說放水和全球變暖的關系。