翻译：北京申办成功后，中国经济增长速度每年将额外增加0．3％。中国经济的发展将大大提速。

After the success of Beijing's bid for China's economic growth rate will increase by 0.3% annually. China's economic development will greatly accelerate. 看看对不对~~我想应该是吧..

After the success of Beijing's bid for the Olympic, its economy growth rate will increase by an extra 0.3% annually.
The development of China's economy will greatly speed up.

no.1 is better