Haiyan is 7 years old. Her parents gave her an iPad as a gift for her birthday. A month later，her eyesight（视力）dropped to 300 degrees. This is serious for such a young child.

    Many children in China are facing the same problem: iPad using is bringing problems to their eyesight. The problem is so common that newspapers even call the iPad the "No. 1 killer of children's eyesight!"

    "There are about 30 shortsighted children coming every day, "said Hu Dali, an eye doctor at Guiyang Aier Eye Hospital. "Half of those children have poor eyesight because they have played with phones and iPads for too long. "

    Doctors and scientists say children's vision（视觉）is not yet fully developed and their eyes get tired more easily. The screen of an iPad uses very bright（明亮的）LED backlight. If children look at an iPad screen for a long time, their eyes do not have time to rest. This will make their eyesight worse over time.

    Doctors advise that users should hold their iPads between 40-60 centimeters（厘米）away from them. The brightness of the screen should be comfortable for children. Parents should also stop their children from using an iPad for more than one hour every day.

    Nadia Comaneci, a famous gymnast (体操运动员) , was born in Romania in 1961.

    When she was doing cartwheels (侧手翻) on the playground at the age of 6, a PE teacher saw her. He told her family that she was very good and advised Nadia to train in the capital of Romania. Although it was a long way from her home, Nadia went because she loved gymnastics (体操).

    After that, she trained hard and took part in lots of competitions. In 1975, she was named as one of the Athletes of the 20th Century.

    In 1976, Nadia went to the Olympics in Canada. She was so fantastic in the competition that everyone waited for the score, a high score. But the scoreboard showed 1.00!

    Everyone was surprised. There wasn't a sound for a moment. Then a voice came, "Ladies and gentlemen, Nadia Comaneci…10!"

    The audience (观众) cheered very loudly. So what happened? Well, when the scoreboard was built, no one thought a score of 10. 00 was possible. The decimal point (小数点) was in the wrong place! In fact, the scoreboard only had three digits (数位) to show scores, such as 9. 50 or 9. 85 at that time.

    In the 1976 Summer Olympics, Nadia Comaneci scored a perfect 10, which was thought impossible before. From then on, she was looked as a hero. In 1984, she got retired (退休的).

Feb. 17 should have been the start of the spring semester for many middle and primary schools in China. However, to control the spread of the COVID-19, many schools had delayed the start of the semester, following instructions from the Ministry of Education (MOE). But students in China were still studying.

Instead of having classes at school, many students in Beijing and Guangzhou began their first day of online classes on Feb 17. Students in Shanghai started online classes on March 2. "In the morning, I have English class, followed by Chinese and math, " Liu Bo, a Junior 3 student from Beijing, told Xinhua. "I have also learned about epidemic(流行病) prevention. "

According to the MOE, students were mainly taking classes to review previous knowledge rather than taking new classes during the online study period. Online courses were required to include contents about epidemic prevention, psychological health (心理健康) and educational activities (教育活动).

"Online courses are only temporary measures (暂时的措施) taken during the epidemic, so when the new semester begins, schools should not replace(替代) classroom teaching with online classes, " Lu Yugang from the ministry told China Daily.

The ministry also called on schools not to increase their students' schoolwork burden(负担). Schools should not ask students to study online for long periods of time or study things beyond( 超出) their curriculum(课程). Students must have enough time to rest, the ministry added. Also, it stressed that protecting students' eyesight must be a priority(优先).