When Elias first met Mandela, he was a poor black worker ____56___ led a difficult life. He went to Mandela for advice because Mandela was generous and often offered ____57____ (guide) to poor blac
25. ________ theme of the Shanghai Expo is “Better city, better life”. It will send _____ message to people around the world to care about the places where they live. A. /…a
中*C连接了四个不同的基团，该分子为手性分子。