清代学者赵翼指出汉初“布衣将相”现象是“前此所未有也。盖秦汉间为天地一大变局”。这种现象说明了（   ）

奶奶摘菜，红红搬来小板凳让奶奶坐下。（   ）

当显微镜的目镜为10×、物镜为10×，在视野直径范围内看到一行相连的8个细胞。 若目镜不变，物镜换成40×时，则在视野中可看到这行细胞中的  (    )

    Last summer, Cathy's family went to New York City for their summer vacation. They stayed there for two weeks. New York City has about seven and a half million people. It is the largest city in the United States.

    First, they visited the Statue of Liberty. It is one of New York's most well-known historical sites(历史景点). Millions of people visit it every year.

    On the second day, they went to the Empire State Building. From the top of the building, they saw most parts of New York. On the third day, they visited the Metropolitan Museum. In this museum, they saw a lot of famous paintings. During the rest time of the week, Cathy went to Bronx Zoo with her younger brother and sister.

    In the second week, the family visited Long Island. They all had a good time.