植物的根既能吸收土壤中的氮、磷、钾等营养物质，又能将其它不需要的物质挡在外面，这主要是由于（　　）

Progress suggests a person's ability to change the way he is living at the moment and it must ______ a better life and a better way of doing things.

阅读理解

                                                                                             (B)

       For the British, the home is private place in which he or she goes to hide away from the troubles of life. It is very seldom that one would be invited to a British person's home. It is rude to knock on a person's door if you are not invited. If you are invited, don't ask to see more than the downstairs that your British host invites you into. Never ask how much the house or any of the items in if cost.
       To the American, most of them want their home to be a place where they can entertain (款待) and share their lives with their friends. They may be delighted to give you a full tour of their houses. They may also be pleased when you show your interest and pleasure in their houses.
       Both British and American people will engage in quite a bit of chat and a drink or two before the meal is served. After the first mouthful, you should say how delicious the food is and ask something about it. Remember, never eat with your mouth open and make very little noise while eating. It would be nice of you to help your host in any way. Maybe offer to pour some drinks or clear up after the meal.

材料一   汉武帝为了任用精通儒家学问的人为官，大力推行儒学教育，在长安设立大学，教授儒家经典；在地方设立官学，用儒家思想培训官员，教化百姓。

材料二  科举制…自产生之日起就确立了由政府出面招生，考生“皆怀牒（证件）自列于州县”的自由报考原则，不论贵族和平民皆可参加公开考试。 ﹣﹣杨齐福《科举制度与近代文化》

材料三   1898年7月，光绪帝正式批准设立京师大学堂，它的办学原则是：以中国的传统学科为主体，引进一些西方学科，构成中西结合的课程内容。

材料四  日本明治政府领导人…并不对西方文明本身感兴趣，而仅仅对其中增加了民族力量的那些组成部分感逃走．…他们提出了一个非凡的改革方案，宗旨在于建立一个强大的日本，而不是完全模仿西方国家。