Jackhasaneighbour.HisnameisWilliam.Heisrich.Helovesmoneyverymuch,andnevergivesanythingtoanybody.Lastweek,Williamwentforawalkwithhisfriendnearapond.Heslippedandfellin.Hisfriendrantohelphim.Hisfriendheldouthishandandsaid,“Givemeyourhand,andIwillpullyouout!”Therichman’sheadwentunderthewaterandthencameupagain,buthedidnotgivehishand.Againhisfriendtried,butagainthesamethinghappened.ThenJackcameandsaid,“TakemyhandandIwillpullyouout!”Therichmantookhishandatonce,andJackpulledhimoutofthewater.“Iknowmyneighbourverywell,”hesaidtotherichman’sfriend.“Yousay‘Give’tohim,hedoesnothing.Butyousay‘Take’,hetakes!”这篇文章主要讲了什么?