The Yukon Quest 1,000-mile International Sled Dog Race is a sled dog race run every February
between Fairbanks, Alaska, and Whitehorse, Yukon．Because of the harsh winter conditions, difficult trail, and the limited support that competitors are allowed, it is considered the “toughest race in the world”．
In the competition, first run in 1984, a dog team leader and a team of 6 to 14 dogs race for 10 to 20 days．The course follows the route of the historic 1890s Klondike Gold Rush, mail delivery, and transportation routes between Fairbanks, Dawson City, and Whitehorse．Players pack up to 250 pounds of equipment and provisions for themselves and their dogs to survive between checkpoints．They are permitted to leave dogs at checkpoints and dog drops, but not to replace them．Sleds may not be replaced and players cannot accept help from non-racers except at Dawson City, the halfway mark．Ten checkpoints and four dog drops, some more than 200 miles apart, lie along the trail．Dcotors are present at each to ensure the health and welfare of the dogs, give advice, and provide veterinary (兽医)care for dropped dogs．
The route runs on frozen rivers, over four mountain ranges, and through isolated northern villages．Racers cover 1,016 miles or more．Temperatures commonly drop as low as −60°F, and winds can reach 50 miles per hour at higher elevations．Sonny Lindner won the first race in 1984 from a field of 26 teams．The fastest run took place in 2009, when Sebastian Sch nuelle finished after 9 days, 23 hours, and 20 minutes．The 2009 competition also had the closest one-two finish, as Sch nuelle beat second-place Hugh Neff by just four minutes．The longest race time was in 1988, when Ty Halvorson took 20 days, 8 hours, and 29 minutes to finish．To allow participation in both the Yukon Quest and the Iditarod, the 2010 Yukon Quest will begin in Fairbanks one week earlier than usual–on February 6．
60．What is the Yukon Quest particular in?
A．The difficulty the competition has to face．    
B．The special team and the special weather．
C．The limitation of time and support in the run．
D．The way the competition is valued．
61．The competitors can do the following except ______．
A．pack less then 250 pounds of equipments and provisions
B．drop any dogs at the checkpoints
C．replace dogs which are worn out
D．get medical care for dogs in any checkpoint
62．Who keeps a new record in the Yukon Quest in terms of speed?
A．Sonny Lindner．     B．Sebastian Schnuelle．C．Hugh Neff．           D．Ty Halvorson．
63．The underlined word “harsh” in the first paragraph might most probably mean “______”．
A．happy                            B．important                   C．difficult                      D．unforgettable