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At the launch ceremony for the new round in Shanghai on Monday, McCully said England has seen real improvement in students' performance in math. The program has been well received by teachers and students, he said, with the math skills of 7-year-olds in some schools gradually approaching government expectations.

At the hospital, the first and second deaths from the COVID-19 were reported on Wednesday and Friday each.

At present, China has built and put into operation more than 150 sets of catalytic cracking units-which break long petroleum molecules into shorter more useful ones-with a total annual processing capacity of nearly 200 million metric tons. Over the years, the catalytic cracking process has produced nearly 70 percent of the nation's gasoline, 40 percent of its propylene and 30 percent of its diesel, according to Science and Technology Daily.

At the same time, the company also introduced advanced techniques to manage the workflow and technological processes, he said.

At the other end of the spectrum, Lagos, Caracas, Yangon, Karachi and Dhaka were the five least safe cities, according to the index.