Write a multi-choice question for the following article, with the given choices and answer: Article: Some caterpillars' warning signals may have evolved from walking. A team, writing in the journal Nature Communications, reported that the hair-like structures the creatures use to make sounds evolved from legs. The team studied caterpillars which use these structures to communicate their ownership of leaves. This means the caterpillars are able to "tell" strangers to go away without risking injury in conflicts. "These are really interesting caterpillars," said Dr. Jayne Yack from Carleton University in Ottawa, Canada, who led the research. "They make signals using hair-like structures which are on their back ends." The caterpillars drag these structures across the leaf to make scraping sounds when strangers enter their "leaf shelters". "When they make this signal, the strangers leave," explained Dr. Yack. "It's like saying 'I'm here, get out of here --I already own this leaf'." The scientists looked at other species within the same group of caterpillars and created a "family tree" of the creatures. They used chemical markers to work out the relationship between the animals, showing which in the group were the more ancient species and which species evolved more recently. "Those more ancient species actually don't have these sound-producing structures. They have legs that they use to walk towards strangers," said Dr. Yack. These more ancient species, she explained, walk towards strangers and try to attack them. "They can kill each other in the conflicts," Dr. Yack added. She said that the evolution of the scraping show had allowed the caterpillars to solve their conflicts without fighting. "So our idea is that these signals actually avoid damage to both sides --they solve conflicts in a more 'friendly' way." The study also provides a map of an evolutionary path that many other biologists are exploring. Options: A They have the same function as hair. B They are found in caterpillars' heads. C They are used to kill strangers. D They may have evolved from caterpillars' legs. Answer: D They may have evolved from caterpillars' legs. Question:
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Answer: What can we learn about caterpillars' warning structures from the text?

Write a multi-choice question for the following article, with the given choices and answer: Article: Which are you more likely to have wath you at sny given mement--your cell phone or your wallet? Soon you may be able to throw your wallet away and pay for things with a quick wave of your smart phone over an electroue scannet. In January, Starbucks announced that customers could start using their phones to buy coffee in 6,800 of its states. This is the first pay-by-phone practice in the U.S., but we're likely to see more witeless payment alternatives as something called ucar field communcation(NFC)GETS IN TO America's consumet electanies. Last Deccmbet some new smart phanes which cantain an NFC chip were introduced to the public. Already in use in part of Asia and Europe, NFC allows shoppers to wave theie phones a few inchs above a payment terminal-a contact-free system build for speed and convenience. plan a few incees live a payment tetminal a one a few ptaht need to be worked out, like who will get to collect the profitable trunsacian fees. Although some credit card providers have been experimenting with wave and pay systems that use NFC enabled credit cards, cellphone service providers truay try to mused their way into the point of sale (POS)market. Three big cell phone service providers have formed a joinf tenture that will go into opention over the next 15 months. Its goal is"to lead the U.S. payments industry from cards to mobile phone." The other big NFC sue, apart from how paymeats will be processed, is security, For instance, what's to stop a thief from digitally pickpocketing you? "We're still not at the point where an attacker can just brush against yee in a crowd and steal all the money out of your phone,"says Jimmy Shah. A mobile security rescarcher, "Usera may also be able to set transaction timeits,requiring a password to be enteced for larger putchases. Bussiness? Keep in mund you lost your smart phone, it can be located on a located on a map and remotely disabled. Plus, your phone can be password protected, Your wallet isn't. Options: A Stop the luneting of niet phones. B Stop a passwant. C Cat all the money out of their phones. D Can large purchases. Answer: A Stop the luneting of niet phones. Question:
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Answer: According to the what can users do if they lose their smart phones?

Write a multi-choice question for the following article, with the given choices and answer: Article: For many workers trying to lose weight, the weekend is a chance to do some exercise and eat something healthier than a supermarket sandwich at their desk. But some slimmers take a slightly different approach -- consuming more than half their weekly calorie intake from Friday night to Sunday. Away from the daily routine at work that helps them keep control of what they eat, they are snacking and drinking their way to a shocking 10,000 calories, a survey has found. Almost three-quarters of people trying to lose weight admit to over-eating at the weekend. A meal with friends or family, complete with alcohol, as well as a late-night snack before bed, can lead to adults consuming up to 3,500 calories in one day, a survey found. Men typically need 2,500 calories a day and women 2,000 calories. Consuming this amount would see men and women get through half their weekly calorie intake over the course of a 'bad' weekend. Women were found to eat less on a Sunday because of guilt over their consumption over the previous two days. Men had fewer doubts about a third day of excess. The biggest weekend diet danger comes from snacking between meals, the survey found. Some say they will often spend Saturday night in front of the TV with their families -- combining watching their favorite shows with crisps and biscuits. And seven in ten people admitted to having fattening takeaways at weekends, with pizza the most popular. Alcohol is another big factor in weekend bingeing.Around 70 percent still like to have a roast on a Sunday or a big meal with family or friends and a third of those will have second helpings. A spokesman from Forza Supplements, the diet company that conducted the survey, said, "We all have bad weekends where we have a lot of fun, but dieting goes out of the window." The 5:2 diet is becoming increasingly popular -- where we limit our calories for five days and allow ourselves a few treats on the other two days. "For many people, the two days off are Saturday and Sunday but they go way too far" Options: A Weekends are vital for diets. B What the 5:2 diet is. C The proper way to lose weight. D People's weekly calorie intake is changing. Answer: A Weekends are vital for diets. Question:
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Answer:
What is the main idea of the text?