①传统文化具有稳定性，但基本内涵会因时而变

②传统文化具有民族性，是民族情感的集中表达

③传统文化影响人们之间的交往行为和交往方式

④传统习俗对人们的物质和精神生活有持久影响

阅读下面的文字，完成小题。
        晏子朝，乘弊车，驾驽马。景公见之曰：“嘻！夫子之禄寡耶？何乘不佼①之甚也？”晏子对曰：“赖君之赐，得以寿②三族，及国游士，皆得生焉。臣得暖衣饱食，弊车驽马以奉其身，于臣足矣。”
        晏子出，公使梁丘据③遗之辂车④乘马，三返不受。公不说，趣⑤召晏子。晏子至，公曰：“夫子不受，寡人亦不乘。”晏子对曰：“君使臣临⑥百官之吏，臣节其衣服饮食之养，以先齐国之民；然犹恐其侈靡而不顾其行也。今辂车乘马，君乘之上，而臣亦乘之下。民之无义，侈其衣服饮食而不顾其行者，臣无以禁之。”遂让不受。                                                                                                                                                                              （选文有改动）
①佼：好。②寿：保。③梁丘据：人名。④辂车：大车。多指君王用的车。⑤趣：同“促”，赶快。⑥临：治理，管理。

    “USA? Britain? Which country is____(good) to study in?” We often hear such discussion. As China opens its door, it is a dream for many Chinese students to study abroad. They want to learn about the outside world.

    It's true that studying abroad can help students develop____(they). Their foreign language skills will____ (improve) and it may be easier to find jobs.

    But there are problems____ should be considered. Language is the first. Students must spend a lot of time____ (learn) another language.

    Students must also learn____ (live) without parents' care and deal with all kinds of things they didn't have to do before, like looking after themselves. There are ____ (report) about Chinese students abroad running into an ocean of difficulties____ giving up in the end. When they have to take care ____ themselves, it is hard for students to study well.

    Finally, studying abroad brings a heavy burden to the family. For most Chinese parents, the cost of studying abroad____ (be) very high. But is it worth it?

把一张长方形纸片ABCD沿EF折叠后ED与BC的交点为G、D、C分别在M、N的位置上，若∠EFG=55°，则∠1=____°，∠2=____°．

西周时“一人跖（踏）耒而耕，不过十亩”；战国时“一夫挟五口，治田百亩”。引起这一变化的根本原因是