听力(listening)

There are two main reasons why the temperature of the air is always changing.One reason is that the air around you moves from somewhere else Air usually moves in large bodies called air masses.Some air masses move in from the north.These air masses usually have cold air that causes the temperature to drop.Air masses also move in from the south.They usually have warmer air that causes the temperature to rise. Temperatures change during the day or night and can be great or small.This depends partly on how many clouds are in the sky.When there are many clouds during the night,they act like the covers on your bed.They blanket the earth and keep the air from losing much of its heat.The temperature usually does not drop much during such a night.When there are many clouds during the day,some of the sun’s energy will not reach the earth.The temperature usually does not rise much on such a day. 问题In which direction do the air masses move with cold air? A、East. B、South. C、North. What happens to the temperature when there are many clouds during the night? A、The temperature rises much. B、The clouds keep up the temperature. C、The clouds keep the air temperature from dropping much.

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解题过程：
1。In which direction do the air masses move with cold air?（带着冷空气的气团在哪个方向？） A、East.B、South. C、North. 选C 根据Some air masses move in from the north.These air masses usually have cold air that causes the temperature to drop （一些气团从北方流入。这些气团通常带有导致温度下降的冷空气）可知，这些气团t来自北方。 2.What happens to the temperature when there are many clouds during the night? （当夜晚有很多云的时候温度会怎样变化？） A、The temperature rises much. （温度上升很多） B、The clouds keep up the temperature. （云保持温度） C、The clouds keep the air temperature from dropping much （云阻止温度下降太多） 选 C 根据.They blanket the earth and keep the air from losing much of its heat.The temperature usually does not drop much during such a night. （他们包围着地球，阻止空气散失太多的热量。在这样的夜晚温度通常不会下降太多。） 孩子 注意文中的几个重点： 1. in large bodies 大规模的 2. air masses 气团 3.depends partly on 一部分依靠。。。 4、act like the covers on your bed 象床上的被子一样 5.blanket the earth 包裹着地球 blanket：　ｎ．　毯子　　　vt. 包裹 6. keep...from doing ... 阻止。。。干。。。 孩子 我讲明白了吗？
最终答案：略