A top Chinese sports official says athletes, coaches and team doctors must pass a written exam on banned substances ahead of the Olympics in Rio de Janeiro as part of the countrys zero-tolerance stance on doping.Vice director of the General Administration of Sports Gao Zhidian told the official Xinhua News Agency on Thursday that only those scoring 80 percent or more will be permitted to go to Rio.Olympics-bound athletes and coaches are also required to sign pledges not to cheat, with Gao saying violators would be severely punished.China has been firmly against doping and has a zero-tolerance approach to this particular problem, said Gao, who is also deputy chef de mission of Chinas 711-member Olympic delegation. We have made it very clear that we want to ensure fair play and the well-being of athletes.China has sought to shake off a reputation for doping, particularly in distance running and swimming, that gave rise to multiple scandals in the 1990s.That resolve was questioned when it emerged that officials waited six months before revealing that champion swimmer Sun Yang served a three-month suspension after testing positive in May 2014. Sun, the gold medalist in the 400- and 1,500-meter freestyle at the 2012 London Olympics, was named male swimmer of the meet at the world championships in Kazan, Russia, in August.China is sending 416 athletes to Rio, including 35 former Olympic champions. China topped the table at the 2008 Games and won the second-most medals in London, including 38 golds.Based on recent performances by Chinese athletes, some studies predict the country could return to the top of the table at Rio with as many as 39 golds.The Associated Press contributed to this report. 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Capitals head coach Adam Oates said Ovechkin was injured in the first period against the Vancouver Canucks on Monday and clarified it was not a head injury. ATLANTA -- Chicago Bulls guard Dwyane Wade says he hasnt spoken to Heat president Pat Riley since last season ended.Wade played in Miami for 13 seasons before signing a two-year deal with the Bulls over the summer, which includes a player option. He makes his first return to the AmericanAirlines Arena as a visitor on Thursday as the Bulls face the Heat.I think you guys know, I havent talked to him, Wade said Wednesday. Its as simple as that. I think Ive been very open and honest about my respect and love with Pat. Ive been honest that I havent spoken to him since the season ended.The general thought throughout the league last summer was that Wade would re-sign with the Heat and ultimately end his career in Miami. After contract talks broke down, Wade decided to sign with the Bulls. The 34-year-old said he has communicated with everyone else in the organization besides Riley.I know who Pat is, Wade said. Its no secret to me. I was there 13 years, Ive seen a lot of players come and go. I know how he is. If youre not with him, youre against him. Thats just the way he is. You got to understand that, man. And Im cool with it. Im fine, 100 percent. I was there 13 years so Ive seen a lot of video tributes, seen a lot of players come in and go out. And Ive seen the way hes responded to them. And I know if youre not with him, youre against him.Wade said he wasnt sure whether he would speak to Riley before the highly anticipated game Thursday.I dont know, Wade said. I plan on playing tonight [against the Atlanta Hawks], focus on this game. And then Ill worry about tomorrow at 8 oclock.Wade isnt sure how hell feel when the Heat play an expected video tribute, as they have for other players who have returned after signing elsewhere.I dont know, Wade said. Ive only experienced it from clapping for other guys who came back. Ive always been appreciative of the guys who came backk and the tributes they got.dddddddddddd I have no idea.LeBron James was very emotional when he saw his tribute, and Mario Chalmers -- the starting point guard on Miamis 2012 and 2013 title teams -- said he was moved by what the Heat did to commemorate his return after a trade to Memphis last year.Its going to be very emotional, that I can say, Chalmers said. With me coming back, I had mixed feelings. The fans welcomed me back, everybody at the arena welcomed me back, but I still had a sour taste in my mouth from how the trade went down ... and Im pretty sure D-Wades going to feel the same way.Wade has remained extremely close with?Udonis Haslem, with whom he shared captaincy in Miami for many years. Hes been in regular contact with Heat coach Erik Spoelstra and continues checking in on some of his former teammates as well.Itll probably be emotional for me, Spoelstra said Wednesday. And then well get to competition, and thats ultimately what its all about.Bulls forward Taj Gibson said Tuesday that Wade has been telling teammates they better be ready to play on Thursday, the second night of a back-to-back and the Bulls third game in four nights.I would love if [the game] wasnt on a back-to-back, Wade said with a smile. I would love if I was able to have a day so I can enjoy my house. Im going to go sleep in my bed for about three hours -- I would love it a lot more. But Im going to take advantage of the moments Im there ... and go out and compete in an arena that I played for 13 years, an environment that Im used to. So its going to be fun from that aspect, but I would love it if the schedule gods would have looked at it a little better and not gave us this on a back-to-back.Information from The Associated Press was used in this report. ' ' '