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
A ① ② B ②③ C ④① D ③④
相关试题
—But for your timely warning, we into great trouble.
—You know we’re friends.
| A．would get | B．must have got |
| C．would have got | D．couldn’t have got |
It’s certainly hard work. But, ________, a man who wishes to have a career has to make a
great many sacrifices.
| A．on the contrary | B．on the other hand | C．for another | D．in addition |
Written in a hurry, . How can it be satisfactory?
| A．t hey found many mistakes in the report | B．Sam made lots of mist akes in the report |
| C．there are plenty of mistakes in the report | D．the report is full of mistakes |
______ , the players began the game.
| A．Having taken our seats | B．Taking our seats |
| C．Being taken the seats | D．After we had taken our seats |
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