题目内容
18．I'm surprised to find that the price of breadhas increased（increase） by 15% in the past 6months．分析 我吃惊的发现在过去的六个月里面包的价格增长了15%．
解答 答案：has increased．在英语中，现在完成时表示过去发生的动作对现在造成的影响和结果；也表示从过去某一时刻开始，持续到现在的动作或状态．根据题干可知，面包价格是从六个月前开始一直到现在总共增长了15%，故应用现在完成时．现在完成时的结构是"have/has+过去分词"，根据the price是不可数名词，应用has．故填has increased．
点评 对于动词的单词填空题，需要注意根据时间判断时态，或根据设空的位置判断是否用非谓语动词．应具体问题具体分析．
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（48）B
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The Yellow River，the world's fifth longest river，watered some of the oldest farms on earth．（46）D Its source（源头）on Qinghai-Tibet Plateau is drying up．In most of the past 35years，it didn't reach the sea．
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（48）B
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（50）E Warmer weather takes water away．The glacier（冰川）are becoming smaller．The source of the Yellow River is drying up because of it．Global warming has had certain effects on water sources．Droughts （干旱） happening around the world make people pay more attention to this fact．
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