①由图（a）、（b）及相关条件可得出的初步结论是：小球静止在斜面上时，____，F越大．

②由图（b）、（c）、（d）及相关条件可得出的初步结论是：小球静止在斜面上时，____．

   We call the Chinese New Year the Spring Festival（春节）. There is a name for each Chinese year. We may call it the year of the sheep , the year of the monkey or the year of the dog. And this year is the year of the horse.
   Before New Year’s Day, people are busy shopping and cleaning their houses. On New Year’s Eve, there is a big family dinner. After dinner, all the family stay up late to welcome the New Year. On the first day of the New Year, people put on their new clothes and go to visit their friends and relatives（亲戚）. They say “good luck” and some other greetings to each other. People usually have a very good time during the festival.

司马迁在《史记·李斯列传》中评论说：“秦无尺土之封，不立子弟为王、功臣为诸侯者，使后无功伐之患。”下列对材料信息的本质理解，最准确的是（    ）

19世纪中期，欧洲一部分女权主义者提出改革服装的倡议，并设计试穿了短裙和女式长裤，女工的服装有所简化。出现这一服装改革潮流的根源是（　　）。​