(C)
Harry Potter and the Deathly Hallows
By J.K. Rowling, paperback (平装书), 784 pages.
Publisher (出版商): Arthur Levine Books (07/07/2009)
Reading level: Age 9~12
Price: $16.69
Deceptively Delici
By Jessica Seinfeld, hard cover (精装书), 204 pages.
Publisher: Collins (09/01/2007)
Reading level: Parents
Price: $12.83
Rich Dad, Poor Dad
By Robert T. Kiyosaki, paperback, 266 pages.
Publisher: Business Plus(01/01/2010)
Reading level: Age 20~25
Price: $5.59
The Road
By Cormac McCarthy, paperback, 304 pages.
Publisher: Vintage Books (09/11/2007)
Reading level: Adults
Price: $5.50
喜马拉雅山上发现海洋生物化石说明（ ）
东汉末年初行州郡县三级制时，一州往往辖有十来个或七八个郡，每郡领十几个县不等。然而到南北朝后期不少的州只辖一二个郡，一郡只辖二三个或一二个县。有的州竟无县可领，有的仅存名目。出现这种局面的主要原因是（ ）
