What section of a textbook states the author’s purpose for writing the book? appendix index bibliography preface

dr. kings dream speech

explanation:

it was late in the day and hot, and after a long march and an afternoon of speeches about federal legislation, unemployment and racial and social justice, the rev. dr. martin luther king jr. finally stepped to the lectern, in front of the lincoln memorial, to address the crowd of 250,000 gathered on the national mall.

the light at the intersection of gurley and montezuma will turn green exactly three seconds after the light at the intersection of gurley and marina.