如图所示，用燕麦胚芽鞘进行实验，一段时间后，会引起弯曲现象的是

阅读下列材料，回答问题。

材料一：长达六年的战争结束时，德、意战败国几乎成了了片废墟，国内经济百废待举；英、法等战胜国“赢得了战争，输尽了财富”，实力大为削弱。……（战后）欧洲传统的国际地位一落千丈，无论是战胜国还是战败国，都沦为二、三流国家。美、苏以欧洲为主战场的“冷战”，更使欧洲人民终于意识到再也不能发生欧洲人打欧洲人的战争了。

材料二：1967年法、意、比、荷、卢、西德等六国将三个经济合作机构合并，统称欧洲共同体。……1991年底，欧共体国家在荷兰马斯特里赫特举行的首脑会议通过了《马斯特里赫特条约》，决定在12国范围内实现经济货币联盟和政治联盟，1993年经济联盟在欧共体的基础上成立。

 如图所示，用手指压圆珠笔芯，笔芯会弯曲，这个实验说明力可以改变物体的____ ．同时手指感到疼痛，说明物体间力的作用是____ 的．

黛玉说香菱“不用一年的工夫，不愁不是诗翁了”，她是不是把写诗看得太简单了？结合课文谈谈，她为什么这样讲？

阅读理解
    Bargaining is the rule here in Beijing. At least, it is so in most markets and back—street clothes shops.  Bargaining is an art and if you are unfamiliar(不熟悉) with it, we'd like to offer you some advice. The tips(窍门) here are often used in Beijing but may help you at any place in the world where bargaining is practiced.
    DO NOT say how much you want to pay for an item(物品) unless it's near the end of the bargaining. Always try and drop the seller's offering price as much as possible before opening your mouth with a price.
    DO throw out really low prices like 10 RMB with a big smile.
    DO keep smiling from the beginning to the end. The seller usually continues bargaining with a happy smiling face. Getting angry hardly gets you the price you want.
    KEEP in mind the price offered by the seller at the beginning is usually at least 40% over the generally reasonable price. It can be up to 500% over.
    DO have an idea of what the item costs. You can ask your friends, people in the hotel or others you know, or look at the list below. This is very general and is based(根据) on a market like Xiu Shui. You may not be able to get the lowest prices at Xiu Shui, especially on a weekend when there are lots of tourists around.