第9题: [单项选择]The first paragraph hints (暗示) ______. A. backpacks are convenient B. someday backpacks can generate electricity C. MP3 players and cell phones can also be put into a backpack D. backpacks hold things for people so as to free their hands to do other things. 参考答案:B 答案解析:[精解] 文章细节题。根据题干提示,浏览文章第一段一下找到选项[A]Backpacks are convenient,但是千万别上当,因为这是明确告诉的,而题干要求中的hint是“暗示”之义,所以是错