下图为处于不同分裂时期的某动物的细胞示意图，下列叙述不正确的是(　　)

民国时期，在社交礼仪上逐渐用西方的握手、鞠躬取代跪拜仪式，称呼上用“先生”、“同志”取代“老爷”、“大人”，这一变化本质上体现了

陆地的基本地形有____、____、____、____、____等五种。

20世纪世界局势风云变幻，综合国力的竞争影响并改变着世界政治格局。阅读材料，回答问题。

材料一：1919年1月，美国总统威尔逊怀着处理战后事宜的计划登上了欧洲大陆，他希望能够主宰在巴黎召开的和平会议。然而，英法等战胜国拒绝了威尔逊的基本设想，美国试图构件战后国际秩序的努力无果而终……

1945年2月，美国的罗斯福、苏联的斯大林和英国的丘吉尔，在克里米亚半岛的雅尔塔商议战后事宜。一个新的世界格局出现了。

——《大国崛起·危局新政》

两次世界大战后分别诞生的国际组织名称。它们的建立，反映出世界人民的什么愿望？

材料二：世界已分为两个敌对的营垒，一边是“极权政体”，一边是“自由国家”，每个国家都面临着两种不同生活方式的抉择；美国要承担“自由世界”守护神的使命，充当世界宪兵的角色。

——1947年3月美国总统杜鲁门国会咨文

阅读理解

B

       When people go to the movies today, they can watch and listen to a story. But when the movie first appeared (出现) many years ago, there was no sound or music. Those silent (无声的) movies play an important role in movie history.

         When movie theatres showed silent movies, musicians were often there to play music along with the movie. Sometimes, musicians also made some special sounds. However, there was no sound in the movie itself. People learnt the story through the actors, the musicians and words on the screen. When movies first had sound, not everyone liked it. Many silent movie actors thought it was hard to act in the new kind of movies. Clara Bow was a famous silent-movie actress in the early 1920s. She was so nervous (紧张的) about her voice  that she couldn't become a star in the world of talking pictures. She then left show business (演艺界).

          The Jazz Singer (1927) was the first movie with sound. Talking pictures became a big success, and there were more and more movies like that. Later, silent movies became history.

根据材料内容选择最佳答案。