阅读下面短文和问题，根据短文内容和每小题后的具体要求，在答题纸相应题号后的横线上写下相关信息，完成对该问题的回答。答语要意思清楚，结构正确，书写工整。
When the Nintendo Wii went on sale, people around the country stood in line for hours to get one. The popular video-game system isn’t just for fun and games. People such as Billy Perry, 64, are using Wii games to recover from pain and injuries. Perry plays Wii boxing and he says the game is helping him regain strength and feeling in his left arm. It is actually helping him recover from a stroke he had last year. A stroke is the sudden loss of consciousness and voluntary movement caused by a blocked artery （受阻碍的动脉）in the brain.

Across the country, hospitals are having patients try their hands at the Nintendo Wii. Playing the games can improve a patient’s strength and coordination （协调能力）. It is especially useful for people who are trying to recover from strokes and broken bones. The Wii console （控制台）has a unique wireless controller. The controller requires players to move their bodies to play Wii games such as tennis, golf and baseball. Experts say the arm and hand movements Wii players make are similar to traditional exercises performed in physical therapy （treatment）.
Physical therapy is often painful. Some medical experts say playing games on the Wii takes patients’ attention away while giving them the exercise they need. Walter Reed Army Medical Center in Washington D.C., offers Wii games for soldiers injured in the war. Doctor Daugherty says the practice is great for young soldiers who are interested in video games. “They think it’s for entertainment, but we know it’s for therapy. ”she says. Some experts want more proof that the Nintendo Wii helps the injured recover. Researchers in Minneapolis are doing a study to measure patients’ functions before and after using a Wii.
按具体要求回答下面问题，在答题纸相应题号后的横线上写下相关信息。
What is the Nintendo Wii? （不多于4个词）
Who might be able to benefit most from Wii games? （不多于8个词）
Why isn’t playing Wii games so painful as physical therapy? （不多于6个词）
What is the main idea of the whole passage? （不多于7个词）