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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
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They carry many genes that keep tumors from developing

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Read the following article and select the best answer. Article: Most of the flowers in nature are red, orange and yellow. If we have seen a black flower, it's a chance in million. People have made a census ( ) to colors of more than four thousand kinds of flowers and discovered that only eight of them are black. As we know, sunlight is formed by seven different colored lights. The wave length of each light is different, so the quantity of heat in each light is also different. Flowers, especially their petals ( ) , are easy to be harmed by high temperature. Black flowers can take in all the light waves which cause the flowers to dry up in a high temperature. So black flowers can rarely survive sunlight. But red flowers, orange flowers and yellow flowers can protect themselves from sunlight by reflecting the red light, orange light and yellow light, each of which has a large quantity of heat. Question: The passage tells us that _ . - black flowers are so weak that it is difficult for them to grow up. - there is only eight black flowers in nature. - sunlight is formed by seven different colored lights, so the wave length of each light is different. - black flowers can take in the light of all the wave lengths which make them dry up because of high temperature.
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black flowers can take in the light of all the wave lengths which make them dry up because of high temperature.

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Read the following article and select the best answer. Article: Mo Yan's winning of the 2012 Nobel Prize in Literature shows the world's recognition of China's contemporary literature, according to the China Writers Association. It also represents the attention drawn to Chinese writers and the international influences of Chinese literature, said an official statement from the organization on Thursday evening. Mo is the first Chinese national to win the Nobel Prize in Literature. In the statement, the association congratulated Mo Yan on his success and spoke highly of his "outstanding achievements". Mo had effectively extended the boundaries of imagination, the depth of thoughts and the state of arts of Chinese literature by focusing on lives in the countryside with a unique national style, said the statement. He Jianming, vice president of the association, said in a separate interview, "It is not only a joyous occasion for Mo, but also a dream coming true for generations of Chinese writers. " "The prize also shows recognition in realism writing coming from traditional Chinese literature, " said He. He cited Mo's latest novel, Frog, which was published in China in 2010, as an example of Mo's focus on realism. The book focuses on the influence of China's "one child" policy in the countryside. "Mo's works are among the best when it comes to Chinese contemporary literature. "He said, "Adding the award is significant for the development of Chinese literature and will improve confidence in the country's cultural creativity. " Mo Yan, a pen name for Guan Moye, was born in 1955 and grew up in Gaomi in east China's Shandong Province. Mo is one of the most widely translated Chinese writers. His best-known work is Red Sorghum, which was made into a film by the director Zhang Yimou. Question: Which is the main idea of the passage? - 2012 Nobel Prize in Literature. - Mo Yan's success represents recognition of Chinese literature. - The success in Chinese literature. - A great Chinese writer.
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Mo Yan's success represents recognition of Chinese literature.