【解析】本题的主题是卡车。因此其可作为线索词。定位在本段第一句话。答案是 75 percent of the nations freight.
【解析】receive缺少宾语,填名词。再根据线索词using a special email address定位原文信息。题干中的can help prevent you from receiving和原文中的eliminates the possibility that you will receive是同义表达,因此unwelcome emails为答案。
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