To compile the scale, called "China's Standards of English Language Ability", experts spent three years collecting data from 160,000 students and teachers and conducted research and studies at more than 1,500 schools in 28 provinces.
Mackerras still goes to China to teach and research music or ethnic minorities. Some of his students have done "very well in the new China", he said.
In years gone by, the media was awashed with cases of dog bites, dogs terrorizing people in public, dog poo all over, dogs barking incessantly in residential neighborhoods depriving residents of sleep, etc.
Gambia's exports have gone mainly to China, India, the United Kingdom and Italy back as far as 2014, while it imported most of its goods from China, Brazil and Indonesia.
With his unremitting efforts and devotion, Mackerras has built a bridge of mutual understanding and amity between our people, said Xi.
China's first evaluation standard for proficiency in English is expected to take effect on June 1, the Ministry of Education said on Tuesday.
He noted that the past year had seen some "outrageous" claims made against China, and the media had been "poisonous".