为测定空气中氧气的含量，小华同学打算设计如下方案：选用实际容积为40mL的试管作反应容器，将过量的自磷放入试管，用橡皮塞塞紧试管，通过导管与实际容积为60mL且润滑性很好的针筒注射器组成如下图的实验装置．假设此实验能够按照小华的设想正常进行，且白磷所占体积与导管内的气体体积忽略不计，请回答下列问题：

作文:

根据下面材料，自选角度，自拟题目，写一篇记叙文或议论文。不少于650字，不得出现真实的人名、校名、地名，不得抄袭。

  我这个人走得很慢，但是我从不后退。——美林肯

完形填空
    This is an educational story．A teacher once told each of her students to bring an empty plastic bag and a large bag of 1 to school．If there was someone in their lives that they 2 to forgive，they chose a potato，  3  the name of that person and the date on it, and then put it  4 the plastic bag．Some of their bags were quite heavy．
    They were then told to5 these bags with them everywhere for one week，putting them beside their beds  6 and next to their desks in the classroom．
    As they carried the bags around with them，they 7 what a weight they were carrying，and how hard they needed to pay attention  8 ． Of course，the potatoes were rotten(腐烂的)soon，and smelled  9 ．
    This is the same as the price we pay for keeping our pain and unhappiness with us!So 10others is not only a gift for them，but also a very good gift for ourselves．

豌豆花的颜色受两对同源染色体上的两对等位基因E/e与F/f所控制，只有当E、F
同时存在时才开紫花，否则开白花。那么可能的亲本基因型组合是

要使下列物质（①金刚石、②食盐、③干冰、④水晶、⑤金属铝）熔化，需要克服微粒间的相互作用，其中克服的相互作用属于同种类型的是（   ）