BEIJING, March 4 (Reuters) - China is willing to work with the United States to promote communication on all levels, while upholding its "red lines" and principles, Lou Qinjian, a spokesperson for its parliament, said on Wednesday.The National People's Congress opens its annual session on Thursday, where it will unveil this year's economic targets and policy priorities.The meeting comes at a sensitive moment for China-US relations, as both sides look to stabilise ties ahead of an expected summit...