What is a hook in the first paragraph of an essay

Who first discovers the alien cylinder on horsell common

How do you think the political and social strife of england influenced jonathan swift ? how were these problems connected to reason

The difference between the present reservoir, with its silent sterile shores and debris-choked side canyons, and the original glen canyon, is the difference between death and life. glen canyon was alive. lake powell is a graveyard. which word best contributes to the author’s sad tone?