比较数的大小，下列结论错误的是（  ）

为了灯泡经久耐用，常向灯泡充的气体是（  ）

下图为春秋战国时期出现的铁器。铁器使用对当时社会经济所产生的影响有（     ）

①提高生产效率，促进经济发展 ②促进封建土地私有制的确立

③使“男耕女织”的小农经济产生 ④促进了封建自然经济的解体

A

    Yao Ming is a very good basketball player in the world. He is 25 years old. He was born in Shanghai, but he lives in the USA with his parents now. Yao Ming is quite tall. But he isn't so strong. He was in the Rockets Team after he left (离开)China. He plays very well in the NBA. Many people come to his match(比赛) in America. Lots of Chinese young men watch the matches on TV. Yao Ming wants to be a superstar one day.