如图，矩形OABC的顶点A，C分别在x，y轴的正半轴上，点D为对角线OB的中点，点E(4，n)在边AB上，反比例函数y＝$\frac{k}{x}$(k≠0)在第一象限内的图象经过点D，E，且tan∠BOA＝$\frac{1}{2}$.

(1)求边AB的长；
(2)求反比例函数的解析式和n的值；
(3)若反比例函数的图象与矩形的边BC交于点F，将矩形折叠，使点O与点F重合，折痕分别与x，y轴正半轴交于点H，G，求线段OG的长．

Xiao Shenyang is not as good ____ acting as Zhao Benshan.

“嫦娥一号”是中国自主研制的第一颗月球探测卫星，它的成功发射，标志着中国实施绕月探测工程迈出重要一步．据此回答下题．

根据短文内容，回答问题。

Pisces (February 20 to March 20)

      It's the sign of the fish. Pisceans are very free-flowing（自由散漫的）people. They often feel bad when they cannot do the things that they want to. When things don't run well, they will often become very angry. A Piscean can usually make the best of a bad situation if they really want to. They can easily get along with other people and the outside world.

      Quality: Negative（阴性）          Ruler: Neptune （海王星）

      Triplicity: Mutable （变通型）     Quadruplicity: Water （水相）

      Pisces can be given cameras, socks and shoes as presents. Music of all kinds is welcome, such as CDs, piano and concert tickets. Anything that makes a Pisces think of water and seas is great, such as ships, going boating, a trip to the sea and a hot bath.

—The teacher lost her temper because Jack was late again today．

  —No wonder I saw Jack was crying just now．