商朝是我国青铜文明的灿烂时期。迄今世界上出土的最重的青铜器是（    ）

    On Thursday evening, Jack goes to bed early. Then he sees a rabbit. Jack doesn't know1it is from. He doesn't have a pet rabbit at home.     “Come on,” says the rabbit. “Let's go to town!” “You can2?” Jack asks. “Yes,” the rabbit answers. “Come 3me.” Then the rabbit goes out of the4Jack goes with it.

    They get to a zoo. In the zoo, a(n)5 is playing the guitar under a tree. “Let's dance!” says the rabbit. Jack 6with the rabbit. And he sees the moon is dancing, too. Jack wants to tell the rabbit about this,7he can't find it. And he doesn't see the zoo or the lion. He sees his8! “Jack, get up! You have to go to school!” says his mom. Jack smiles and he can't wait to9his mom about the dream. It's so10.

地球半径约为（　　）