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第四部分：阅读理解(第31～45题，每题3分，共45分) 下面有3篇短文，每篇短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案涂在答题卡相应的位置上。 31 One characteristic of weather maps not mentioned by the author in this passage is __________． A wind speed B thermal changes C fronts D barometric pressure 32 The thirty-day forecast is determined by examining __________． A upper air levels B satellite reports C changing fronts D daily air maps 33 The observation of weather conditions by satellites is advantageous because it __________． A gives the scientist information not obtained readily otherwise B enables man to alter the weather C uses electronic instruments D is modern 34 A weather map is synoptic because it __________． A summarizes a great deal of information B can be interpreted accurately C appears daily D shows changing fronts | 
