阅读理解。

        The celebration of Thanksgiving will be not perfect without turkey. It gets its name from the turk

turk sounds it makes when frightened. Turkey was at one time being considered as the national symbol

(象征) of America. Benjamin Franklin felt that turkey was the, right choice because it was a good runner

and had good eye. 

       It is said that pilgrims (清教徒) had a large meal with cooked turkey after their first harvest in the

year 1621.It continued for three days and included ninety Indians.    

      Queen Elizabeth of 16th century England ate roast goose (烤鹅) during a harvest festival. From

then on, goose became a favorite bird at harvest time in England. However,when the pilgrims arrived in

America, they replaced(用......替换) the roast goose with roast turkey as it was easier to find.

      Today,every house cooks turkey as the main dish during the celebration. The festival completes

with the ' Turkey Song' .

1. Why did Benjamin Franklin feel that turkey could be considered as the national symbol of America?

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2. How many Indians were there during the large meal served by the pilgrims in 1621? 

3. What does the underlined word "it" refer to in the third paragraph?

4. What's the best title of this passage?