2004年以来,中国通过原始创新、集成创新和引进消化吸收再创新,取得了一系列重大技术创新成果。形成了具有世界领先水平的高速铁路技术体系。今天,中国已步入高铁时代,并正在成为高铁技术输出国。中国高铁的发展历程表明 ①创新就是对既往的否定和对现实的肯定 ②创新的过程必定是“扬弃”的过程 ③创新推动科技进步和社会生产力发展 ④创新推动生产关系和人类思维的变革
The baby cried again. The young mother felt very ____ and her husband wore ____ expression on his face, too.
There is ____ Mr. Smith at the door who wants to speak to you.
To make sure that he was at home, I called him up ____ . A. by chance B. in general C. in particular D in advance
In face of ____ failure, it is the most important to keep up ____ good state of mind.
_____ from the table, he made a suggestion that we _____some money for those who suffered a great loss in the terrible earthquakes.