已知等比数列{a_n}满足a₁＋a₂＝3，a₂＋a₃＝6，则a₇＝(　　)

    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.

书法是以汉字为表现对象，以线条为表现手段的造型艺术。“中国是一个书法大国，拿起鼠标以后，也不能忘了笔杆。”对此正确的理解是（　　）