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【填空答案】
climatic: adj.connected with the weather in a particular area 气候的
iceage: one of the long periods of time,thousands of years ago, when ice covered many northern countries 冰川期，冰河时代
consistent: adj. alwayshaving the same beliefs, behavior, attitudes, quality etc（信仰、行为、态度、品质等）一贯的，一致的；始终如一的
disturb: v. tointerrupt someone so that they cannot continue what they are doing by asking aquestion, making a noise etc 干扰，打扰；使中断
radiate: v. ifsomething radiates light or heat, or if light or heat radiates from something,it is sent out in all directions 辐射（光或热）；（向四面八方）发射
crude: adj. notdeveloped to a high standard or made with great skill 粗制的
approximation: n. ［C］a number,amount etc that is not exact, but is almost correct 概算，近似值
hypothesis: n. ［C］pluralhypotheses, an idea that is suggested as apossible way of explaining a situation, proving and idea etc, which has not yetbeen shown to be true 假设，假说
speculate: v. to thinkor talk about the possible causes or effects of something without knowing allthe facts or details 猜测，推测
disperse: v. ifsomething disperses or is dispersed, it spreads over a wide area（使）消散；（使）分散
cooling: n.［U］the process ofbecoming cooler; a falling temperature 冷却
【听力原文】
Today I want to talk about the Earth's last major climatic shift, at the end of the last ice age. But first, let's back up a moment and review what we know about climatic change in general. First, we defined "climate" as consistent patterns of weather over significant periods of time. In general, changes in climate occur when the energy balance of the Earth is disturbed.Solar energy enters the Earth's atmosphere as light and is radiated by the Earth's surface asheat. Land, water, and ice each affect this energy exchange differently. The system is so complex that, to date, our best computer models are only crudeapproximations and are not sophisticated enough to test hypotheses about the causes of climatic change. Ofcourse, that doesn't keep us from speculating. For instance, volcanic activity is one mechanism that might affect climatic change. When large volcanoes erupt,they dispersetons of particles into the upper atmosphere, where the particles then reflectlight. Since less light is entering the system of energy exchange, the result would be a cooling of the Earth's surface. Of course, this is just one possible mechanism of global climate change. In all probability, a complete explanation would involve several different mechanisms operating at the same time.
