蔬菜是老百姓的日常生活品，蔬菜价格关系居民生活水平，面对日益上涨的蔬菜价格，市民们各有各的买菜经验。请说明下表中买菜经验的经济学依据。

“黟县小桃源，烟霞百里间。地里灵草木，人尚古衣冠。”李白的《小桃源》道出了安徽黟县乡村的独特意境：山水风物幽美，古老文化酝酿出醇厚从容的民风人情。西递的老巷、老屋与老人，以生动的方式，让人领略到曾领风骚数百年的徽文化乃至中国传统文化的精髓与神韵。材料说明了(   )

哥伦布航海的目的是(    )

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    As young students, you have many dreams. These dreams can be very big, such as winning the Nobel Prize; they can also be small, such as becoming one of the best students in your class.Once you find a dream, what do you do with it ? Do you ever try to make your dream real?
    Andrew Matthews, an Australian writer, tells us that making your dreams real is life's biggest challenge. You may think you're not very good at some school subjects, or that it's impossible for you to become a writer. Those kinds of ideas stop you from realizing your dream. In fact, everyone can realize his dream. The first thing you must do is to remember what your dream is. Don't let it leave your heart. Keep telling yourself what you want every day and then your dream will come true faster. You should know that a big dream is, in fact, made up of many small dreams.
    You must also never give up your dream. There will be difficulties on the road to your dreams. But the biggest difficulty comes from yourself. You need to decide what is the most important. Studying instead of watching TV will help you to get better exam results, while saving five yuan instead of buying an ice cream means you can buy a new book.
    As you get closer to your dream, it may change a little. This is good as you have the chance to learn something more useful and find new hobbies.

下列各句中划线成语的使用，全都不正确的一项是（    ）

①科举考试创设之初，制度并不完善，因为没有“糊名”“誊抄”等防作弊手段，考官若要上下其手，可谓易如反掌。

②从托举女童的“最美路人”到拾金不昧的“最美的哥”，从救学生的“最美教师”到救患者的“最美医生”，无不彰显着从善如流的道德风尚。

③为什么人言可畏？因为一次又一次的毁谤，积累下来足以致人于毁灭之地，那是一种铄石流金的力量。

④当前，党和政府正在努力倡导“大众创业，万众创新”。应该说，作为寒窗七载的研究生毅然去创业，无可非议，但要摆摊卖烤脑花，就值得商榷了。

⑤入夏以来，天气异常，五风十雨，致使城市内涝、市民受灾的情况不断发生，有的人甚至因雨水过大而付出生命的惨重代价。

⑥新世纪初，某出版社出版了一套“走向诺贝尔”文学丛书，丛书囊括了当代可能获得诺贝尔文学奖的中国作家的作品，真可谓洋洋大观。