Students from one class are separated into two different classrooms at Beijing No. 161 High School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10. (Photos: Xinhua)

Students queue up while keeping distance to have body temperature checked at Beijing No. 161 High School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

A student follows marks on the ground to head for his classroom at Guangqumen Middle School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

A staff member measures body temperature for a student at Beijing No. 161 High School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

Students enter the front gate of Beijing No. 161 High School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

Students of grade 12 cheer for themselves at Guangqumen Middle School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

A student scans a health QR code before entering the campus at the High School Affiliated to China Agricultural University in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

A mother takes photos for her son to mark the restart of classes at Beijing No. 161 High School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

Students are in class at the High School Affiliated to China Agricultural University in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

Students are in class at the High School Affiliated to China Agricultural University in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

A student is about to pass a temperature measuring passage at Beijing No. 161 High School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

Students are in class at a classroom with notice showing the disinfection information at the entrance at Guangqumen Middle School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

Students of a class are transferred to an indoor gymnasium to ensure the safe distance between seats at Guangqumen Middle School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

A student disinfects his hands before entering a body temperature measuring passage at the High School Affiliated to China Agricultural University in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.

Students of grade 12 are in a class on psychological adaption and epidemic prevention at Guangqumen Middle School in Beijing, capital of China, April 27, 2020. Senior high schools in Beijing on Monday restarted classes for seniors, who will take the national college entrance exam on July 7-10.