Given the question: Read the following article and select the best answer. Article: In the digital age, getting students into classrooms is an increasingly challenging mission for college and university teachers, not to mention retaining their attention. "It's much harder to teach the post-90s,,,said Chen Jixiu , a math professor at Fudan University. "They use smart-phones and tablets to search for information, even during class. They get knowledge from a variety of sources, and consider it 'a small cake ,to skip classes. " According to Chen, this situation has forced teachers to adopt "odd tricks" for attracting students to class. Here are some interesting ideas picked up by 21st Century. Food for Thought: Rather than providing only moral encouragement, teachers at Wuhan University are offering real-life related rewards to improve student attendance. Students sitting in the first row of the health psychology course taught by professor Lei Wuming are rewarded with snacks. "I've got 7,000 fans on my micro-blog ,and most of them are my students,"said Lei ,director of the university's Education Institution. "I do want to express my thanks to those coming to listen, and to make the class more lively. " Teacher vs Phone; In the broadcasting and hosting course of Hankou University, teacher Huang Huiqiong gives students permission to busy themselves with their cell phones during class. They keep their heads down until they hear something interesting. If not, they can sit through the entire class without being disturbed and even give the teacher advice following the class. "A teacher is not the boss and students have the right to make content suggestions,,,said Huang. Friendly Blogs: You might hesitate to participate in class discussions, but what if you could send a message instead of speaking out loud? In the computer science course at Changsha University of Science Technology (CUST),students can voice opinions via their cell phone. "I open a micro-blog webpage,and when students text a message to the account, it appears on the screen,,,said teacher Huang Qiang. Su Ying, 19,a sophomore at CUST,... Question: Teaching the post-90s students is getting harder because _ - they all use smart-phones and tablets - they are focused on digital stuff - they are more likely to skip classes - they have a bigger resource to learn
The answer is:
they have a bigger resource to learn