Come prepared: When you arrive at a race, your bike should be in race-ready condition. Chain Management: Chain damage is still the number one problem with mountain bikes. Keeping your chain clean and well-oiled will help, as will frequent chain replacement. Periodic inspection of your chain for wear, stretch and damage may save you a long walk home. Packing Tape: This can be used for rims trips, boots for fractured tires and a dozen more makeshift repairs. If you've flown to the race, it also saves you from having to borrow tape to close up your bike box for the flight home. Other musts: safety pins and plastic zip ties. Pre-race: Visual inspections before any serious off-road ride, carefully examine the area where the tire hooks onto the rim and remove any foreign objects which could cause premature（比预期早的）tire wear. Tire Pressure: Check tire pressure before race start. The recommended pressure is noted on the tire sidewall, usually 40 lbs., many racers run 50 lbs., or more for less rolling resistance. Be Self-Contained: Make sure you are self-contained. Bring your own drinking water, food and first aid kit. Also have tools, spare parts, tubes, quick fills and a chain tool. Never suppose you can just borrow these items from a friend. Post-race Visual Inspections: Inspect your bike after completing each event, especially before competing in a downhill event. Re-inspect before packing your bike for the trip home. Have Fun! 73. This passage is written for those who _______. A. go in for outdoor activities                        B. love cycling in other places C. will join in mountain bike races                 D. are preparing for a marathon 74. The writer seems to advise the racers ________. A. not to replace chain frequently                   B. not to take an extra chain C. to bring less while racing                          D. to have higher tire pressure 75 The passage is organized in order of _______. A. importance             B. time                      C. readers' interest       D. place 76. From the passage we can safely say that _______. A. a foreign tire is a guarantee for the cyclist to win the race B. the biggest trouble for the race is that nobody will help you C. a downhill event causes more damage to the bike than an uphill one D. regular inspection is a must before, during, and even after the race