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Article: Nature is full of color, from rainbows and roses to butterfly wings and peacock tails. Even the fruits and vegetables you eat have different colors: blue blueberries, red strawberries, green broccoli, and orange carrots. Plant and animals often use color to attract attention. The substances responsible for these colors belong to a class of chemical called antioxidants . Plants make antioxidant to protect themselves from the sun's ultraviolet(UV) light. Ultraviolet light causes chemicals called free radicals to form within plant cells. They can destroy parts of plant. Free radicals also have damaging effects on human beings. Some of these effects like wrinkled skin can be seen. The damage is caused by the free radicals attacking cells in our bodies. Certain cancers and heart disease are linked to free radicals. Our bodies have natural defences for fighting off free radicals. While we are young, our defences are pretty strong. However, they get weaker as we get older. The body's built-in defences can only go so far without extra help. The key to fighting free radicals with fruits and vegetables is to mix and match colors. It's like sunscreen for the inside of your body. Go for a range of very bright colors. Colorful foods contain hundreds of healthy chemicals not found anywhere else. Research into how chemicals in blueberries affect the brain's function in rats suggests that these chemicals may help our own brains work more efficiently. Don't just blame the sun. Ultraviolet light isn't the only source of free radicals. If you breathe polluted air such as smog, automobile exhaust , or wasted gas from a factory, you take in chemicals that also cause such damage. And, the body itself produces free radicals as it processes food. Question: We need extra help for fighting off free radicals from fruits and vegetables because _ . Yes or no, is the answer "our defences get weaker as we get older"?
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No

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Article: Researchers may tell us that spending money on experiences produces more happiness than spending money on things. Going to a bar with friends is always pleasurable in slightly different ways. However, on the other hand, a table may also give us lots of positive experiences sometimes. I just moved from New York City to suburban Pennsylvania, It's been quite a change of pace, with some positives and negatives, One of the best parts is that I'm spending more time outside. I quite enjoy staying outside, especially eating outside. I had a goal to eat outside as often as possible this summer, so one of my first purchases for the new house was a table and a set of chairs for the yard. Is my yard table a thing or an experience? It's clearly a thing and yet it enables the experience of eating outside. I love eating outside, and so my yard table is one of my favorite purchases, ever. Therefore I find the dividing line between things and experiences is more nuanced than at first glance. However, to be happy, the most important thing is what kind of purchases you have made. Sometimes we may all have purchases that seem like a waste of money like probably half the clothes in our closets, but how does this happen?' There are many reasons for why this happens. The biggest is that we spend a lot of our time working to earn money to buy things. The problem is that we buy a lot of stuff that we don't actually need. There's nothing worse than looking in your closet and realizing how many hours you spent laboring to buy things you never wear. But how about a table that lets you enjoy being outside in the summer? That's worth every minute and penny and from it you will also get more happiness. Question: What does the text mainly talk about? Yes or no, is the answer "What the best purchase is."?
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No

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Article: Zheng He made seven heroic voyages to Asia and Africa between 1405 and 1433, which predated the Westerners' Voyages of Discovery by almost a century . Despite Zheng He's remarkable maritime feats , with larger and matchless fleets until World War I , he is ly unknown worldwide compared with his Western counterparts like Columbus and Vasco da Gama . Why ? Sadly , much of the official Chinese records of these voyages were destroyed after his death , by order of his powerful enemies at Court . They were opposed to his expeditions , both on economic and other grounds . Further , the Ming History made only little mention of his exploits . Most surprisingly , not even his date of death and burial place were recorded . Therefore , his final resting place is still a matter of _ .So he became only a legend and folk hero in his life time . However , hardly any Chinese works on him have been translated into foreign languages . Ironically , it was due to a handful of famous Western researchers like prefix = st1 /Needham, Zlevathes and , most recently , Menzies that the world is now more familiar with his greatness . Zhen He's rightful place in Chinese history has been confirmed by none other than Deng Xiaoping in 1984 , when he addressed the nation's People's Congress in Beijing : "...The Ming dynasty , under Yongle Emperor , did wisely pursue an open-door policy resulting in Zheng He's famous maritime expeditions overseas . However , after Yongle's death, Chinadeserted this policy resulting in foreign intervention andChina's final humiliation during the 19th century . The open-door policy is therefore the way forward forChina." Following a more realistic overall appraise by scholars East and West of Zheng He's achievements , his standing as one of the greatest maritime explorers of all time has at last been firmly recognized worldwide . Question: Zheng He's success in his maritime expeditions overseas mainly resulted from_. Yes or no, is the answer "Yongle Emperor's open-door policy"?
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No