阅读两篇短文， 从下面每小题所给的A、B、C、D四个选项中， 选出最佳选项
Students at the primary school and junior high school in Shenzhen are having daily PE. Is it good?
Buxin Primary School in Luohu District uses a"3+1+1" model —three regular(正规的)PE classes, one music-based exercise class, and one sports game class. That is, students have a total of five PE classes per week.
One problem is the number of PE teachers is not enough to teach all the new classes. Teachers from other subjects even have to lead many of the PE classes. Liu Xunhua,a Chinese-language teacher at the school, has also taken on the role of a part-time PE teacher. Liu leads students in activities such as jumping ropes and jumping jacks.
Another problem is that there is limited(有限的) space. "At most, there will be eight classes in PE at the same time," said Sun Shou-ping, director of the school's PE team. Longhua Foreign Languages School also makes full use of all spaces in the school. For example, students can practise running uphill and do jumping exercises on the steps. If there are too many PE classes at the same time, teachers can also take students to the public basketball court at the Luhuo park, which is just across the street from the school playground.
Students truly welcome the new measure. However, there are also concerns. Both parents and teachers are afraid the reduced(减少的) learning time for other subjects may lead to bad grades.