Reread the sentences at lines 69-70, "Until one day some kid with a ring in his ear…comes knocking. Hard like that—rapping at his door." How the description of Yoni and the use of the words knocking and rapping help the reader understand the effect Yoni has when entering Sergei's life.

Yoni's description shows that he looks unusual and for Sergei. While the words "knocking" and "rapping", show how evasive Yoni was in Sergei's life causing something of great influence.

Explanation:

Sergei is not an Arab boy like Yoni, which shows that Yoni may have unusual customs and looks for Sergei, like wearing an earring, something that draws Sergei's attention because he is different and exotic.

Yoni has a very big impact on Sergei's life, as Sergei accidentally kills him because he thinks Yoni tried to catch his magic fish. This impact can be shown by the words "knocking" and "rapping" that give the feeling that something invasive, loud and disconcerting is happening.

mark twain, real name samuel langhorne clemens, was an american writer, humorist, entrepreneur, publisher, and lecturer. among his novels are the adventures of tom sawyer and its sequel, the adventures of huckleberry finn, the latter often called "the great american novel". wikipedia