学进去

No one can live without sleep. Experts believe that sleep is 1． food and water. Good health needs good sleep. Scientists have found that people who sleep for less than 6 hours and a half at night are more often ill than people 2． sleep for 8 hours.

How 3． hours do you sleep every night? Most students have less than 8 hours of sleep every night. Some teachers complain that a few students feel sleepy or even fall asleep in class. These students can 4． concentrate(集中注意力）on their study.

Why are so many students short (缺少）of sleep? Recently, a reporter did a survey in No. 21 Middle School. The result shows that there are two main 5． about this problem. One is that students have too much homework at night. Some students have to 6． up late to finish their homework till 11:00 p.m. The 7． reason is about the use of Internet. Some students are crazy about playing games on the phones.

Many parents worry about this problem. The Ministry of Education （教育部）has paid more attention 8． this problem and required that students in primary schools should 9． at least 10 hours a day, 9 hours for junior high and 8 hours for senior high. Schools are expected to give less homework to students 10． that they can have more time to sleep.