历史和现实都告诉我们,只有( )。它承载着几代中国共产党嗯的理想和探索,寄托着无数仁人志士的夙愿和期盼,是近代以来中国社会发展的必然选择。
A. 中国特色社会主义才能救中国
B. 社会主义才能救中国
C. 社会主义才能发展中国
D. 中国特色社会主义才能发展中国
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What are the types of different rails according to the conversation in U4?Usually, there are two operational steel rails, monorail, cog rail or _______ etc.
Sometimes there is only one single rail for the train to run, which is called ____.
A cog rail or a rack rail is a railway with a ________rack rail, usually between the running rails.
The trains are fitted with one or more cog wheels or ______ that mesh with this rack rail.