题目

据市场分析，南雄市精细化工园某公司生产一种化工产品，当月产量在10吨至25吨时，月生产总成本y(万元)可以看成月产量x(吨)的二次函数；当月产量为10吨时，月总成本为20万元；当月产量为15吨时，月总成本最低为17.5万元，为二次函数的顶点．写出月总成本y(万元)关于月产量x(吨)的函数关系．已知该产品销售价为每吨1.6万元，那么月产量为多少时，可获最大利润？阅读理解 　　Most episode (情况) of absent-mindedness—forgetting who you left something or wondering why you just entered a room — are caused by a simple lack of attention, says Schacter. “You're supposed to remember something, but you haven't encoded (译成密码) it deeply.” 　　Encoding. Schacter explains, is a special way of paying attention to an event that has a major impact (影响) on recalling it later. Failure to encode properly can create annoying situations. If you put your mobile phone in a pocket, for example, and don't pay attention to what you did because you're involved in a conversation. you'll probably forget that the phone is in the jacket now hanging in your wardrobe (衣柜) . “You memory itself isn't failing you. ”says Schacter, “Rather, you didn't give your memory system the information it needed.” 　　Lack of interest can also lead to absent-mindedness. “A man who can recite sports statistics (数据) from 30 years ago. ”says Zelinski . “may not remember to drop a letter in the mailbox.” Women have slightly better memories than men, possibly because they pay more attention to their environment, and memory depends on just that. 　　“Visual cues can help prevent absent-mindedness.” says Schacter. “But be sure the cue is clear and available. ”he cautions. If you want to remember to take a medication (药物) with hunch, put the pill bottle on the kitchen table. Don't leave it in the medicine chest and write yourself a note that you keep in a pocket. 　　Anther common episode of absent-mindedness: walking into a room and wondering why you're there. Most likely, you were thinking about something else. “Everyone dose this from time to time.” says Zelinski. The best thing to do is to return to where you were before entering the room, and you'll likely remember. 1．We can learn from the passage that encoding [　　] A．slows down the process of losing our memories B．helps us understand our memory system better C．gets us to recall something from our memories D．helps us to find out the mobile phone in the pocket 2．Why do women have better memories than men? [　　] A．They seldom use their mobile phones. B．They are more nervous about the environment. C．They are more interested in what's happening around them. D．They usually take same special medicine to improve memories. 3．The underlined sentence in Paragraph 4 means [　　] A．putting something in sight can be a good reminder B．people of absent-mindedness must take medicine with them C．a note in the pocket will easily get lost D．taking medicine can get rid of absent-mindedness 4．What can be the best title for the passage? [　　] A．The Cause of Absent-mindedness. B．The Environment and Memory. C．A Way of Encoding and Recalling. D．The Process of Gradual Memory Loss.