Read the following article and select the best answer. Article: Taste is such a subjective matter that we don't usually conduct preference tests for food. The most you can say about anyone's preference is that it's one person's opinion. But because the two big cola companies--Coca-Cola and Pepsi Cola are marketed so aggressively, we've wondered how big a role taste preference actually plays in brand loyalty. We set up a taste test that challenged people who identified themselves as either Coca-Cola or Pepsi fans: Find your brand in a blind tasting. We invited staff volunteers who had a strong liking for either Coca-Cola Classic or Pepsi, Diet Coke, or Diet Pepsi. These were people who thought they'd have no trouble telling their brand from the other brand. We eventually located 19 regular cola drinkers and 27 diet cola drinkers. Then we fed them four unidentified samples of cola one at a time, regular colas for the one group, diet versions for the other. We asked them to tell us whether each sample was Coke or Pepsi; then we analyzed the records statistically to compare the participants' choices with what mere guess-work could have accomplished. Getting all four samples right was a tough test, but not too tough, we thought, for people who believed they could recognize their brand. In the end, only 7 out of 19 regular cola drinkers correctly identified their brand of choice in all four trials. The diet-cola drinkers did a little worse----only 7 of 27 identified all four samples correctly. While both groups did better than chance would predict, nearly half the participants in each group made the wrong choice two or more times. Two people got all four samples wrong. Overall, half the participants did about as well on the last round of tasting as on the first, so tiredness, or taste _ , was not a factor. Our preference test results suggest that only a few Pepsi participants and Coke fans may really be able to tell their favorite brand by taste and price. Question: According to the passage the preference test was conducted in order to _ . - show that a person's opinion about taste is mere guess-work - compare the ability of the participants in choosing their drinks - find out the role taste preference plays in a person's drinking - reveal which cola is more to the liking of the drinkers
find out the role taste preference plays in a person's drinking

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Read the following article and select the best answer. Article: His name was Fleming, and he was a poor Scottish farmer. One day, while trying to make a living for his family, he heard a cry for help coming from a nearby bog. He dropped his tools and ran to the bog. There, tapped to his waist in black mud, was a terrified boy, screaming and struggling to free himself. Farmer Fleming saved the boy from what could have been a slow and terrifying death. The next day, a fancy carriage pulled up to the Scotsman' s surroundings. An elegantly dressed nobleman stepped out and introduced himself as the father of the boy Farmer Fleming had saved. "I want to repay you," said the nobleman. "You saved my son' s life." "No, I can' t accept payment for what I did," the Scottish farmer replied, waving off the offer. At that moment, the farmer' s own son came to the door of the family hovel . "Is that your son?" the nobleman asked. "Yes, "the farmer replied proudly. "I' ll make you a deal. Let me take him and give him a good education. If the boy is anything like his father, he' ll grow to a man you can be proud of." And that he did. In time, Farmer Fleming' s son graduated from St. Mary' s Hospita l Medical School in London, and went on to become known throughout the world as the noted Sir Alexander Fleming, the discoverer of penicillin. Years afterward, the nobleman' s son was stricken with pneumonia . What saved him? Penicillin. The name of the nobleman? Lord Randolph Churchill. His son' s name? Sir Winston Churchill. Someone once said, "What goes around, comes around." Question: Why did the nobleman come to the poor farmer' s house? - Because they were close s. - Because they were good friends. - Because the nobleman knew the farmer had a promising son. - Because he wanted to thank the great farmer for saving his child.
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Because he wanted to thank the great farmer for saving his child.

Read the following article and select the best answer. Article: Elephants have impressed us for centuries. They are big, clever, and sociable. But what if someone told you that they may also hold the key to fighting cancer? People have been wondering why elephants do not develop cancer, even though they have life spans that are similar to humans, living for around 50 to 70 years. Now scientists believe they know why. A team at the University of Chicago, Us has found that elephants carry a large number of genes that stop tumors from developing. To be precise, they found 20 copies of an anti-tumor gene called TP 53 in elephants. Most other species, humans included, only carry one copy. According to the research, which was recently published on the online science network BioRxiv, the extra copies of the gene improved the animal's sensitivity to DNA damage. This lets the cells quickly kill themselves when damaged before they can form deadly tumors. "An increased risk of developing cancer has stood in the way of the evolution of large body sizes in many animals," study author Dr Vincent Lynch told The Guardian. If every living cell has the same chance of becoming cancerous, large creatures with long life spans like whales and elephants should have a greater risk of developing cancer than humans and mice do. But across species, the risk of cancer does not show a connection with body mass. _ was found by Oxford University scientist Richard Peto in the 1970s and later named "Peto's paradox". Evolutionary biologists believe it results from larger animals using protection that many smaller do not, In the elephant's case, the making of TP53 is nature's way of keeping this species alive. The study also found that when the same genes were brought to life in mice, they had the same cancer resistance as elephants. This means researchers could use the discovery to develop new treatments that can help stop cancers from spreading or even developing in the first place. "Nature has already figured out how to prevent cancer," said Joshua Schiffman, an oncologist at the School of Medicine,... Question: Why are elephants unlikely to develop cancer? - They have a large body size - They carry many genes that keep tumors from developing - Certain genes in their body kill existing tumors - Their genes suffer no DNA damage
They carry many genes that keep tumors from developing