背完新概念英语3和4册能否听得懂cctv9的英文

If you can recite these articles really fluently and have a good command of all the vocabularies that come up in the contexts, you should be able to understand the news.
But NCE does not cover all the words in the news especially some up-to-date words. Your own level of listening should also be taken into account. The reporters speak really really fast. In the past, some spoke too fast so that even the foreigners could not catch what they had said.
So CCTV9 has introduced some reporters from english-speaking countries.

This may work but it varies from person to person.

英语不是这样学的！看你提的问题就知道你有些急于求成。要想真正学扎实，不可能单看一本书就可以的。你必须经历很多很多英语方面的知识，听力、阅读、写作、翻译及相关的背景等甚至整个欧洲的历史。那样学出来的才是真正的英语。

哈哈，你可以试一下阿，对你没坏处的。