RewriteEngine on
RewriteRule  ^book/([0-9]+)\.html$  book\.php\?id=$1
RewriteRule  ^class/(.*)\.html$  class\.php\?id=$1
RewriteRule  ^read/([0-9]+)/([0-9]+)/([0-9]+)\.html$  read\.php\?id=$1_$2_$3
RewriteRule  ^top/(.*)\.html$  top\.php\?id=$1
RewriteRule  ^list/([0-9]+)/([0-9]+)/index\.html$  list\.php\?id=$1_$2