A staff member disinfects a classroom at a middle school in Tianjin, north China, July 3, 2020. This year's national college entrance exam in China will start from July 7. Strict anti-coronavirus measures are required across the country to ensure the safety and health of the candidates for the exam. (Photos: Xinhua)

School doctor Liu Xiumin checks medical supplies at the No. 12 Middle School in Beijing, capital of China, July 3, 2020. This year's national college entrance exam in China will start from July 7. Strict anti-coronavirus measures are required across the country to ensure the safety and health of the candidates for the exam.

A staff member checks the temperature monitoring equipment at the entrance of a middle school in Taiyuan, north China's Shanxi Province, July 3, 2020. This year's national college entrance exam in China will start from July 7. Strict anti-coronavirus measures are required across the country to ensure the safety and health of the candidates for the exam.

Teachers disinfect desks at a middle school in Tianjin, north China, July 3, 2020. This year's national college entrance exam in China will start from July 7. Strict anti-coronavirus measures are required across the country to ensure the safety and health of the candidates for the exam.

Staff members disinfect a classroom at the No. 12 Middle School in Beijing, capital of China, July 3, 2020. This year's national college entrance exam in China will start from July 7. Strict anti-coronavirus measures are required across the country to ensure the safety and health of the candidates for the exam.

A staff member checks the temperature monitoring equipment at the entrance of a middle school in Taiyuan, north China's Shanxi Province, July 3, 2020. This year's national college entrance exam in China will start from July 7. Strict anti-coronavirus measures are required across the country to ensure the safety and health of the candidates for the exam.

Teachers rehearse for the exam at the No. 12 Middle School in Beijing, capital of China, July 3, 2020. This year's national college entrance exam in China will start from July 7. Strict anti-coronavirus measures are required across the country to ensure the safety and health of the candidates for the exam.

A staff member disinfects a classroom at a middle school in Tianjin, north China, July 3, 2020. This year's national college entrance exam in China will start from July 7. Strict anti-coronavirus measures are required across the country to ensure the safety and health of the candidates for the exam.