Last summer, Cathy’s whole family went to New York City for their summer vacation. They stayed there for two weeks.

New York City has more than seven and a half million people. It is the largest city in the United States. It is also the home of the United Nations.

First they visited The Statue of Liberty. The Statue of Liberty is one of New York’s most well known historic sites. Millions of people visit New York City every year.

On the second day they went to the Empire State Building. It is the tallest building in New York City now. 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, Bob went to Bronx Zoo with his younger brother and sister. There they were glad to see a lot of their favorite animals-tigers, lions, monkeys, and elephants.

In the second week, the family visited Long Island. On the island, they spent most of their time swimming sunbathing and playing on the beach. They all had a good time.

如果将长度为a-2、a+5和a+2的三根线段首尾顺次相接可以得到一个三角形，那么a的取值范围是（ ）

A．a>-1

B．a>2

C．a>5

D．无法确定