、阅读理解(20分)(A)John is 14 years old. He is a student of Grade Eight. He was a very active and happy boy two years ago. But everything changed after he started to play computer games. He never plays basketball or football with his friends any more(再也). And when he sits in the classroom, he cant listen to the teachers. He sleeps in class. And he spends less and less time in studying. So he gets bad marks in tests. But he is very different after school is over. He stays in the net bar until it i