Article: Down on the beach of Dover,56-year-old Channel swimmer Jackie Cobell bravely set off for Calais.The time was 6:40 am.28 hours and 44 minutes later the exhausted,successful mother from Kent crawled to the shore and walked proudly into the record books.After five years in training,Mrs.Cobell became the slowest person to cross the Channel under her own steam.The previous record for the slowest crossing,set by Henry Sullivan at 26 hours and 50 minutes,has stood for 87 years before Mrs.Cobell started at Dover Saturday morning. She had struggled through changing tides that swept her first one way,then the other.It turned the 21-mile crossing into a 65-mile one.She declared,"Time and tide wait for no man--and they certainly didn't wait for me.I was fully expecting it to get dark before I got to Calais but I never imagined I'd also see the dawn again.But I wasn't going to give up." Her feat raised more than $2,000 in charity sponsorship for research into Huntingdon's disease,a sum that was continuing to grow as news of her achievement spread.That was why she did it."I don't really know myself," she said."I just kept thinking of all the people I'd be letting down if I stopped." Mrs.Cobell took to the water so well at school.But after bringing up two daughters,she started to gain weight.Five years ago she took up swimming again and decided to prepare for the Channel challenge to lose weight.She became much fitter.Then came the big swim."I practiced on Windermere Lake," she said."it's about half the distance of the Channel so I just doubled it,added some extra time,and worked out I could probably get to Calais in about 16 hours." Her husband David,trainer,official observer and friend sailed alongside her on a boat.She said,"I sang to keep myself going.When they told me I was a record breaker I thought they were just having a joke--until I realized it was the record for the slowest crossing.But maybe next time I might be a bit quicker." Question: Mrs.Cobell crossed the Channel for the main purpose of _ . Yes or no, is the answer "raising money for charity"?
No

Article: Suppose we built a robot to explore the planet Mars. We provide the robot with seeing detectors to keep it away from danger. It is powered entirely by the sun. Should we program the robot to be equally active at all times? No, the robot would be using up energy at a time when it was not receiving any. So we would probably program it to stop its activity at night and to wake up at dawn the next morning. According to evolutionary theory of sleep, evolution equipped us with a regular pattern of sleeping and waking for the same reason. The theory does not deny that sleep provides some important restorative functions. It merely says that evolution has programmed us to perform those functions at a time when activity would be inefficient and possibly dangerous. However, sleep protects us only from the sort of trouble we might walk into; it does not protect us from trouble that comes looking for us. So we sleep well when we are in a familiar, safe place, but we sleep lightly, if at all, when we fear that bears will nose into the tent. The evolutionary theory explain the differences in sleep among creatures. Why do cats, for instance, sleep so much, while horses sleep so little? Surely cats do not need five times as much repair and restoration as horses do. But cats can afford to have long periods of inactivity because they spend little time eating and are unlikely to be attacked while they sleep. Horses must spend almost all their waking hours eating, because what they eat is very low in energy value. Moreover, they cannot afford to sleep too long or too deeply, because their survival depends on their ability to run away from attackers. Question: The author uses the example of the robot in space exploration to tell us _ . Yes or no, is the answer "the reason why men need to sleep"?
Yes

Article: Jumping on your bike, even in the city, is becoming increasingly popular--- in London, for example, cycle use has more than doubled in the past ten years. So, which is the best bike for you? If you're traveling to work, a folding bike such as one of the models here is suitable unless you're cycling more than a couple of miles, in which case it might be uncomfortable . You can take a fold-up on the train and as it goes indoors with you, it's secure . For longer journeys, a road bike with drop handlebars and narrow tyres is a good choice. Try Specialized, from PS400. Note that the riding position encourages you to look downwards, which can be dangerous. Mountain bikes are best suited to off-road travel; their fat and strong tyres are good for climbing steep, muddy slopes . Good brands include Trek and Giant, with prices starting at less than PS300. A hybrid bike (halfway between a mountain bike and a road bike) is a good compromise with more upright riding position and thin, fast tyres. Ridgeback makes great hybrids, from around PS350. For a classic sit-up-and-beg bike, it's still hard to beat Pashley, which makes its bikes by hand. Expect to pay around PS500. Once you've picked your bike, sizing is crucial or you may suffer back or neck pain. A famous bike shop will help you choose the right size frame. The height of the seat should be adjusted carefully---again, a good shop will advise. If you only plan to cycle once or twice a month, you can choose a lower-priced bike, but for regular use, paying more means better quality: cheaper bikes need more frequent adjustment of brakes and gears ---and tend to be heavier, too. Finally, items such as mudguards aren't always included. Question: Which company's bikes are handmade? Yes or no, is the answer "Pashley's."?
Yes