Read the article and select the best answer. Article: You may have noticed that you feel hungry a lot. This is natural----during teens, a person's body needs more nutrients to grow. Snacks are a great way to satisfy that hunger and get all the vitamins and nutrients your body needs. But you need to pay attention to what you eat. Filling your stomach with a lot of fries after class may give you a short-time help, but a snack high in fat and calories will only slow you down in the long time. To keep energy levels going---and avoid gain weight---keep away from foods like candy or soda. Look for foods like bread and grains and combine them with some food like peanut butter or low-fat milk or cheese. Choosing healthy snacks means shopping smart. Be careful of the health instructions on food bags. Here are some things to watch out for. That something is "all natural " doesn't necessarily mean that it's nutrients. For example, "all natural" juice drinks or sodas can be filled with sugar (which means they'll be high in calories and give you little nutrition.) A granola bar is a good example of a snack that people think is healthy. Although granola bars can be a good source of certain vitamins and nutrients, may also contain a great deal of fat, including a particularly harmful type of fat called trans fat. Check the Nutrition Facts instructions on the bag to be sure. Question: We need snacks to _ . Options: A: reduce energy B: gain weight C: help grow D: keep healthy
C

Read the article and select the best answer. Article: Like people, plants experience stress. And also, like people, the response to that stress can determine success. Bad environmental conditions, such as drought, flood, heat and other stresses, affect yields more than crop pests and diseases. We are trying to find a way to equip plants with the ability to tolerate environmental stress and maintain high yields, said Stephen Howell, a professor of genetics and cell biology. Plant cells produce proteins and ship them to different parts of the cell. Under normal conditions, these proteins are folded into their normal, healthy structures as they are produced. When a plant is under stress, its cells produce poorly folded or unfolded proteins. Then a built-in system senses this and "sets off an alarm in the cell," said Howell. In response to the alarm, another protein (IRE1) starts working and creates a different process which activates the stress response genes whose products bring about defensive measures that help the plant survive. "As it turns out, responses that are activated under stress conditions actually inhibit the growth of plants," said Howell. "This allows them to preserve their energy to survive the stress conditions." For plants in the wild, this response is a help for survival, he said. In production of agriculture crops, however, this response reduces yields. "You don't want crop plants to stop growing," Howell said. "You want them to continue to grow and produce even though they are under stress." With the new understanding of this stress response, the next step may be to silence the alarm system, said Howell. "What may be important is to disable some of these stress responses. That may make the plant more productive under stress conditions." Question: According to the text, an alarm in the plant cells is caused by _ . Options: A: the folded proteins B: the changed proteins C: the defensive measures D: the stress response genes
B

Q: Read the article and select the best answer. Article: What does it mean to cry over a book? "I'm a reader who did not weep," Ruth Graham, a well-known critic, wrote. "Does this make me heartless? Or does it make me a grown-up?" Tears have played a surprisingly important part in the history of the novel. Readers have always asked about the role that emotion plays in reading: What does it mean to be deeply moved by a book? Which books are worthy objects of our feelings? In different times, people answered those questions in different ways. In the early eighteenth century, when the novel was still a new form, crying was a sign of readers' virtue. "Sentimental" novels, full of touching scenes, gave readers an occasion to exercise their "finer feelings." Your tear proved that you were likely to feel the suffering of others. At that time, sentimental novels were hugely popular, but also easy to attack. Tears, after all, had no necessary connection to actual virtue, and they could be not true As the critic John Mullan points out, by the end of the eighteenth century, the word "sentimental" had acquired a new meaning -- "addicted to low emotion" -- bringing it closer to the meaning that it has for us today. In the nineteenth century, the meaning of tears evolved in two different directions. Some writers sought to waken "higher" feelings in their readers: Victorian sentimentalists wrote touching scenes in an effort to inspire social and political reform. However, the "sensation" novel, a different type of Victorian best-seller, showed that tears could be enjoyable in themselves. Sensation novels were the leaders of the modern thriller and mystery. Heavy on secrets, and madness, they were known for creating physical "sensations" in their readers -- trembling, a fast beating heart, and tears. But these were tears without moral purpose or effect. Today's debate about crying while reading looks back on all of this history. The debate, in fact, is about why books matter to us, and what reading is "for." Talking about what makes us cry is a way of talking about ourselves. Question: The author presents this text mainly _ . Options: A: by providing examples B: by making comparisons C: by following the order of time D: by following the order of importance
A: C

Q: Read the article and select the best answer. Article: Maybe you don't know the fact that the green forests we see from an airplane or from the highway can be false. Because centuries ago forests were twice as many as what they are today. A hike into many of those woods will tell different stories, too--of diseases and insects that are slowly killing trees, of some forests that are burned by fire, of logging that local people do more often. Deforestation and degradation of the world's forests mainly harm the basic ability of those ecosystems to function or provide services, such as fresh water, air, plants and animals, which benefit people everywhere and keep the balance of nature. Deforestation Forests today are a small part of what they once were. Nearly half of the world's forest cover is gone, and each year 40 million acres more are cut and replaced by agriculture and development. Over the next 45 years, wood use in the world is guessed to increase by 50 per cent over its present rate. Many of the forests that remain are severely destroyed, which harms the ability to protect birds or wild animals, and to supply natural resources to people. Deforestation also brings about between 20 per cent and 25 per cent of all air pollution causing global climate change. Degradation Forests continue to be degraded by some uses such as the gathering of wood for fuel, the arrival of pests and diseases that kill trees, the effects of climate change and poor management such as the fire, flood and so on. Question: Deforestation can do all the following harm EXCEPT _ . Options: A: cause global climate change B: take away animals' habitats C: stop agriculture developing D: reduce natural resources
A: C