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: What is a bird's "territory"? Yes or no, is the answer "An area which a bird considers to be its own"?
Yes

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Article: HOUSTON (AP) --- A 10-year-old boy fatally shot his father Friday, striking him several times as he sat in the front seat of a SUV to pick up the boy from his mother's home for a weekend visit. The incident happened about 3pm on a cul-desac in the 1700 block of Cedar Cove Court, said Sgt. Williams of the Harris County Sheriff's Department. An investigation found that Rick James Lohstroh, 41, was shot by his son, who was sitting in the back seat of the man's Toyota 4-Runner, said Sgt. Williams. The shooting took place outside the home of Lohstroh's ex-wife, where the boy lives with his mother and a 7-year-old brother. "We're not certain of anything until we finish our investigation," Williams said. "The information we have at this time is that the 10-year-old did fire the weapon." The mother and the 7-year-old were inside the house when the shooting occurred, said Williams. Williams said the gun belonged to the boy's mother. After firing shots through the back seat, the boy exited the back of the vehicle and continued to fire at the car. The man died on the way to Memorial Herman Hospital. Lohstroh was a doctor at the University of Texas Medical Branch. The man and woman shared custody of the children. Williams said the mother and the boy were still in the home talking to investigators Friday night. Neighbors described the family as being quiet and keeping to themselves. Justin Gray, 17, was walking in the neighborhood when he heard gunshots. "We've had a suicide in this neighborhood once, but never anything like this," Gray said. Question: What can we infer from the text? Yes or no, is the answer "The boy's parents got divorced(="separated).""?
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Yes

Ques: Article: Chimpanzees, long considered reluctant to share, apparently can display selfless tendencies, revealing one more key way our closest living relatives are like humans, scientists find. These findings could shed light on the evolution of _ in humans. Previously, a belief was widely held that human altruism evolved only after humans split from their ape cousins about 6 million years ago. In recent years, however, research has revealed just how much chimpanzees have in common with us. They can hunt with spears, play with dolls and mourn their partners' death. "Most of the earlier studies had presented the apes with a complex implement that helped them deliver food to themselves or others, often so complicated that the experiments tested tool skills rather than social tendencies," De Waal told Live Science. "Ours is the first study that uses no such implement at all." In addition to using complex food-delivery systems, past experiments often placed the chimpanzees so far apart that they might not have realized how their actions benefited others. In these new, simplified experiments, two apes were housed next to each other with a screen through which they could see each other. Then, one chimpanzee had to choose between two differently colored tokens from a bin, one of which represented a pro-social option, the other a selfish option. The pro-social option would cause both chimpanzees to receive a piece of banana wrapped in paper. The selfish option only rewarded the ape who made the choice. In a study with seven adult female chimps placed into various pairs, the scientists found all the apes showed a definite preference for the pro-social option. "For me, the most important finding is that like us, chimpanzees take into account the needs and wishes of others," researcher Victoria Horner, said. The chimpanzees behaved especially altruistically toward partners who either patiently waited or gently reminded them that they were there by drawing attention to themselves. They were less likely to reward partners who... Question: Which of the following might be the best title of the passage? Yes or no, is the answer "Chimps Do Show Selfless Behavior"?
Ans: No

Ques:Article: When you think of all the ways your body can get hurt---falling off a bike, stepping on a nail, being bitten by a crazed dog---the aches and pains that come from sitting at a computer may not seem like much. But more doctors are getting worried about just that. If you sit at a PC the wrong way, the nerves and muscles in your back, neck and arms can get out of line. _ is the study of how people work and how jobs and equipment can be designed so that people are safer and more comfortable in the things they do---whether that's working on a factory assembly line or sitting in front of a computer. The monitor You should not have to tilt your neck up or down to lock at the screen. Your eyes should be level with the top of the screen. How far away should you sit? Reach your arm out so your fingertips just touch the screen. The keyboard It should be directly in front of you. Don't unfold the legs on the bottom of the keyboard so that it tilts up toward you---it should be as flat as possible, or even tilted away from you. You want your wrists "neutral," which means straight, not bent. This puts less strain on your nerves and muscles. Arms should be close to the body. Don't look at your fingers as you type. Use a document holder to hold papers at the same level as the monitor. Keep the mouse on the same level as the keyboard and close by--- so you don't have to reach for it. The chair Your feet shouldn't dangle---the blood will pool in your feet. They should rest flat on the floor, or on phone books, if necessary. Your back needs support. Roll up a towel and stick it there. The Body If you think of your body as a collection of right angles when you sit at a computer, you should be just fine. Your hips should be at a 90-degree angle to your back. That takes the pressure off the spine. And your knees should bend at a 90 degree angle so your feet are flat. Question: The passage mainly talks about _ . Yes or no, is the answer "avoiding pains caused by using PC"?

Ans:
Yes