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Article: Have you ever wondered why birds sing? Maybe you thought that they were just happy.After all,you probably sing or whistle when you are happy. Some scientists believe that birds do sing some of the time just because they are happy.However,they sing most of the time for a very different reason.Their singing is actually a warning to other birds to stay out of their territory Do you know what a "territory" is? A territory is an area that an animal,usually the male,claims as its own.Only he and his family are welcome there.No other families 0f the same species are welcome.Your yard and house are your territory where only your family and friends are welcome.If a stranger should enter your territory and threaten you,you might shout.Probably this would be enough to frighten him away. If so,you have actually scared the stranger away without having to fight him.A bird does the same thing. But he expects an outsider almost any time,especially at nesting season.So he is screaming all the time,whether he can see an outsider or not This screaming is what we call a bird's song,and it is usually enough to keep an outsider away. Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs. You can see that birds have a language all their own.Most of it has to do with attracting mates and setting up territories. Question: Why do birds keep on singing at nesting season? Yes or no, is the answer "Because their singing helps frighten outsiders away."?
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No

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Article: Why are people interested in eating raw foods or whole foods? One reason is that eating these types of food reduces the risk of acid accumulation in your body. Raw and whole foods are usually digested more efficiently than cooked and refined foods. When we cook foods, we destroy the natural enzymes that are part of the food in its raw form. These enzymes were intended by nature to help us digest the food. When we consume food without these natural enzymes, our bodies either digest the food improperly or allow too many nutrients to be absorbed into the bloodstream. In both instances, the result is obesity. When too many nutrients are absorbed at once, the body grows fat. Improperly digested food moves slowly through the digestive tract, where it becomes increasingly acidic . To protect its vital organs from this acidic waste, the body changes the acid into fat and stores it safely away from the organs. Processed foods contain chemical elements, which might confuse the appetite mechanism that tells us when we've had enough to eat; as a result, people often overeat . Processed foods also upset the digestive cycle. The body will either identify these foods as allergens and then store them safely away from the organs as fat, or the remains of undigested food will become acidic and enter the bloodstream as acid waste, which will stick to the blood vessel walls and block the passage of vital oxygen and nutrients heading for the body's cells. The body's metabolism becomes inactive, and then result is weight gain and obesity. The accumulation of acid in the digestive tract makes digestion increasingly inefficient. When that happens, even healthy foods can become acidic and the food allergies will become more common. To stop this vicious circle in its tracks, people need to consume food and supplements that will neutralize (...)the acid already accumulated in body. Eating the right types of raw and whole foods can help. it's also important to restore your enzyme balance. You need to identify and avoid the foods that... Question: . What is the main purpose of this passage? Yes or no, is the answer "To advocate eating more raw and whole foods"?
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No

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Article: When the musical sound rings you, you immediately reach for your pocket ready to have a chat. But although you probably use it all the time, have you ever thought about the manners related to talking on the phone? If you haven't, here are some tips to guide you. *Always give the person you are calling plenty of time to get to the phone before you hang up. If the person who answers is not the one you want, give your name and ask if you may speak to the person you want. *Think about the time you call people. Try not to call too early in the morning (before about 9:00) or too late at night (after about 9:30). Also try not to call at mealtimes. *If you go by plane to visit your relatives at Christmas, remember to follow airline instructions. Cell phone must be turned off as soon as the plane doors are closed and remain so until the doors open again on arrival. *When you're face to face with someone, do not talk on the phone. It is rude to be on the phone when a waiter is trying to take your order in a restaurant, or when you are returning the shoes you have just been trying on in a shop. Finish any face-to-face business before taking a call. Continuing to use the phone while nodding to the person in front of you is quite impolite. *When in a restaurant with your friends, keep phone conversations short. Make a call only if it is important. Practice speaking in a low voice. If no one turns to your way, _ . *If you go to a theatre, a concert or a cinema, consider the other people around you. Check that your phone is "off" before you enter. If you are expecting a very important call, put your phone on "vibrate" and run for the exit as soon as you feel it. If you forget both "off" and "vibrate" and your phone rings, don't answer it, turn it off straight away. Question: From the tips given above, we can decide the writer must agree with the opinion that _ . Yes or no, is the answer "the way we use the cell phones tells what we are like"?
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Yes