Article: A new study says that birds living in big cities sing shorter, faster songs that are higher-pitched than those sung by their brothers in the forests. The researchers think that the birds adjust their songs to allow themselves to be heard over the noises of the city, especially the low traffic noise. To study how urban birds song, Hans Slabbekoorn and Ardie den Bore, biologists at the University of Leiden in Netherlands, travelled around Europe and recorded bird songs in ten major cities and in nearby forests. The species they focused on, the great tit , is widespread across Eurasia and one of the few types of birds that _ in big cities. Singing is crucial for males, which use their songs to attract mates and mark out their territory. The changing songs could play a role in eventually causing the city birds and the forest dwellers to evolve into separate species. The findings could also help explain why usually only a few bird species thrive in cities. By contrast, many more bird species tend to be found in forests and other undeveloped habitats. Studies like this could eventually help researchers predict how urbanization will affect birds, using this knowledge could help urban planners design more pleasant city environments, study co-author Slabbe-koorn said. "You can make a city much more livable if you pay attention to where the noise goes and where the people go," he said. "It would be easy to fit the birds into those models." Then cities wouldn't be strictly for the people, but also for the birds. Question: Males usually sing their songs to _ . Yes or no, is the answer "attract mates and mark out their living area"?
Yes
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Article: One cold day in winter, my wife and I were walking back home from the grocery store as usual when we suddenly decided to walk into a coffee shop. My wife ordered a coffee at the counter. Just then, I saw a young woman in her thirties helping with a rather weak Mexican woman into the shop. Maybe it was the gentleness of their difficult experiences or an unclear familiarity with the situation that drew my full attention. I immediately had a strong wish to do something for them. Unfortunately, before I could think of anything reasonable to say, they left the coffee shop without ordering anything! When my wife returned, I told her about the two women and said, "I missed the chance to do something for them." Strangely enough, though, they came back into the same coffee shop five minutes later. Unbelievable! "This is my chance," I thought out loud as my wife shared some creative possibilities. The two women ordered, took their place card and left the counter. After quickly finishing our coffee, we walked up to the counter and asked the smiling cashier , "What is your most popular dessert ?" Chocolate Cake," she answered. With a childlike feeling of happiness, my wife made an unusual order. "Can I buy a chocolate cake for the two women who were here just before us? But don't tell them it is from us. Just give them this card," she said while taking out a smile card. The cashier couldn't believe it. " Do you do this all the time?" she asked. " Not all the time, but just whenever the heart calls for it," I answered with a natural smile. We, my wife and I, are people of middle income . That night, we had planned to have our once-in-a-while dinner at a restaurant. But walking out of that coffee shop, both of us stood upright and said, "Let's eat at home today." It's more filling to give a chocolate cake than to eat it. Question: What did the author's wife do for the two women? Yes or no, is the answer "She ordered a cake for them."?
No
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Article: Dear Maya Shao-ming, To me, June 6, 1990 is a special day. My long-awaited dream came true the minute your father cried, "A girl!" You are more than just a second child, more than just a girl to match our boy. You, little daughter, are the link to our female line, the legacy of another woman's pain and sacrifice 31 years ago. Let me tell you about your Chinese grandmother. Somewhere in Hong Kong, in the late fifties, a young waitress found herself pregnant by a cook, probably a co-worker at her restaurant. She carried the baby to term, suffered to give it birth, and kept the little girl for the first three months of her life. I like to think that my mother--your grandmother--loved me and fought to raise me on her own, but that the daily struggle was too hard. Worn down by the demands of the new baby and perhaps the constant threat of starvation, she made the painful decision to give away her girl so that both of us might have a chance for a better life. More likely, I was dropped at the orphanage (M JLR) steps or somewhere else. I will probably never know the truth. Having a baby in her unmarried state would have brought shame on the family in China, so she probably kept my existence a secret. Once I was out of her life, it was as if I had never been born. And so you and your brother and I are the missing leaves on a family tree. Do they ever wonder if we exist? Before I was two, I was adopted by an Anglo couple. Fed three square meals a day, I grew like a wild weed and grasped all the opportunities they had to offer--books, music, education, church life and community activities. In a family of blue-eyed blonds, though, _ . Whether from jealousy or fear of someone who looked so different, my older brothers sometimes teased me about my unpleasing skin, or made fun of my clumsy walk. Moody and impatient, burdened by fears that none of us realized resulted from my early years of need, I was not an easy child to love. My mother and I conflicted countless times over the years, but gradually came to see one... Question: What can be inferred from Mommy's Anglo family life? Yes or no, is the answer "She used to experience an identity crisis."?
No
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